Delete vendored code and update CI to Go 1.13 (#158)

As the Go community transitions to using the modules ecosystem,
we want to only support one way of managing dependencies.
So this change moves to only using Go modules for dependency management.

This means that our effective minimum Go version increases to Go 1.11.
To account for this, we also update:
  - the documentation
  - Makefile
  - CI scripts

12 files changed, 0 insertions, 253 deletions

diff --git a/vendor/golang.org/x/sys/cpu/cpu.go b/vendor/golang.org/x/sys/cpu/cpu.go
deleted file mode 100644
index 3d88f86..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu.go
+++ /dev/null
@@ -1,38 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package cpu implements processor feature detection for
-// various CPU architectures.
-package cpu
-
-// CacheLinePad is used to pad structs to avoid false sharing.
-type CacheLinePad struct{ _ [cacheLineSize]byte }
-
-// X86 contains the supported CPU features of the
-// current X86/AMD64 platform. If the current platform
-// is not X86/AMD64 then all feature flags are false.
-//
-// X86 is padded to avoid false sharing. Further the HasAVX
-// and HasAVX2 are only set if the OS supports XMM and YMM
-// registers in addition to the CPUID feature bit being set.
-var X86 struct {
-	_            CacheLinePad
-	HasAES       bool // AES hardware implementation (AES NI)
-	HasADX       bool // Multi-precision add-carry instruction extensions
-	HasAVX       bool // Advanced vector extension
-	HasAVX2      bool // Advanced vector extension 2
-	HasBMI1      bool // Bit manipulation instruction set 1
-	HasBMI2      bool // Bit manipulation instruction set 2
-	HasERMS      bool // Enhanced REP for MOVSB and STOSB
-	HasFMA       bool // Fused-multiply-add instructions
-	HasOSXSAVE   bool // OS supports XSAVE/XRESTOR for saving/restoring XMM registers.
-	HasPCLMULQDQ bool // PCLMULQDQ instruction - most often used for AES-GCM
-	HasPOPCNT    bool // Hamming weight instruction POPCNT.
-	HasSSE2      bool // Streaming SIMD extension 2 (always available on amd64)
-	HasSSE3      bool // Streaming SIMD extension 3
-	HasSSSE3     bool // Supplemental streaming SIMD extension 3
-	HasSSE41     bool // Streaming SIMD extension 4 and 4.1
-	HasSSE42     bool // Streaming SIMD extension 4 and 4.2
-	_            CacheLinePad
-}
diff --git a/vendor/golang.org/x/sys/cpu/cpu_arm.go b/vendor/golang.org/x/sys/cpu/cpu_arm.go
deleted file mode 100644
index d93036f..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu_arm.go
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package cpu
-
-const cacheLineSize = 32
diff --git a/vendor/golang.org/x/sys/cpu/cpu_arm64.go b/vendor/golang.org/x/sys/cpu/cpu_arm64.go
deleted file mode 100644
index 1d2ab29..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu_arm64.go
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package cpu
-
-const cacheLineSize = 64
diff --git a/vendor/golang.org/x/sys/cpu/cpu_gc_x86.go b/vendor/golang.org/x/sys/cpu/cpu_gc_x86.go
deleted file mode 100644
index f7cb469..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu_gc_x86.go
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build 386 amd64 amd64p32
-// +build !gccgo
-
-package cpu
-
-// cpuid is implemented in cpu_x86.s for gc compiler
-// and in cpu_gccgo.c for gccgo.
-func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
-
-// xgetbv with ecx = 0 is implemented in cpu_x86.s for gc compiler
-// and in cpu_gccgo.c for gccgo.
-func xgetbv() (eax, edx uint32)
diff --git a/vendor/golang.org/x/sys/cpu/cpu_gccgo.c b/vendor/golang.org/x/sys/cpu/cpu_gccgo.c
deleted file mode 100644
index e363c7d..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu_gccgo.c
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build 386 amd64 amd64p32
-// +build gccgo
-
-#include <cpuid.h>
-#include <stdint.h>
-
-// Need to wrap __get_cpuid_count because it's declared as static.
-int
-gccgoGetCpuidCount(uint32_t leaf, uint32_t subleaf,
-                   uint32_t *eax, uint32_t *ebx,
-                   uint32_t *ecx, uint32_t *edx)
-{
-	return __get_cpuid_count(leaf, subleaf, eax, ebx, ecx, edx);
-}
-
-// xgetbv reads the contents of an XCR (Extended Control Register)
-// specified in the ECX register into registers EDX:EAX.
-// Currently, the only supported value for XCR is 0.
-//
-// TODO: Replace with a better alternative:
-//
-//     #include <xsaveintrin.h>
-//
-//     #pragma GCC target("xsave")
-//
-//     void gccgoXgetbv(uint32_t *eax, uint32_t *edx) {
-//       unsigned long long x = _xgetbv(0);
-//       *eax = x & 0xffffffff;
-//       *edx = (x >> 32) & 0xffffffff;
-//     }
-//
-// Note that _xgetbv is defined starting with GCC 8.
-void
-gccgoXgetbv(uint32_t *eax, uint32_t *edx)
-{
-	__asm("  xorl %%ecx, %%ecx\n"
-	      "  xgetbv"
-	    : "=a"(*eax), "=d"(*edx));
-}
diff --git a/vendor/golang.org/x/sys/cpu/cpu_gccgo.go b/vendor/golang.org/x/sys/cpu/cpu_gccgo.go
deleted file mode 100644
index ba49b91..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu_gccgo.go
+++ /dev/null
@@ -1,26 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build 386 amd64 amd64p32
-// +build gccgo
-
-package cpu
-
-//extern gccgoGetCpuidCount
-func gccgoGetCpuidCount(eaxArg, ecxArg uint32, eax, ebx, ecx, edx *uint32)
-
-func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32) {
-	var a, b, c, d uint32
-	gccgoGetCpuidCount(eaxArg, ecxArg, &a, &b, &c, &d)
-	return a, b, c, d
-}
-
-//extern gccgoXgetbv
-func gccgoXgetbv(eax, edx *uint32)
-
-func xgetbv() (eax, edx uint32) {
-	var a, d uint32
-	gccgoXgetbv(&a, &d)
-	return a, d
-}
diff --git a/vendor/golang.org/x/sys/cpu/cpu_mips64x.go b/vendor/golang.org/x/sys/cpu/cpu_mips64x.go
deleted file mode 100644
index 6165f12..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu_mips64x.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build mips64 mips64le
-
-package cpu
-
-const cacheLineSize = 32
diff --git a/vendor/golang.org/x/sys/cpu/cpu_mipsx.go b/vendor/golang.org/x/sys/cpu/cpu_mipsx.go
deleted file mode 100644
index 1269eee..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu_mipsx.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build mips mipsle
-
-package cpu
-
-const cacheLineSize = 32
diff --git a/vendor/golang.org/x/sys/cpu/cpu_ppc64x.go b/vendor/golang.org/x/sys/cpu/cpu_ppc64x.go
deleted file mode 100644
index d10759a..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu_ppc64x.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build ppc64 ppc64le
-
-package cpu
-
-const cacheLineSize = 128
diff --git a/vendor/golang.org/x/sys/cpu/cpu_s390x.go b/vendor/golang.org/x/sys/cpu/cpu_s390x.go
deleted file mode 100644
index 684c4f0..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu_s390x.go
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package cpu
-
-const cacheLineSize = 256
diff --git a/vendor/golang.org/x/sys/cpu/cpu_x86.go b/vendor/golang.org/x/sys/cpu/cpu_x86.go
deleted file mode 100644
index 71e288b..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu_x86.go
+++ /dev/null
@@ -1,55 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build 386 amd64 amd64p32
-
-package cpu
-
-const cacheLineSize = 64
-
-func init() {
-	maxID, _, _, _ := cpuid(0, 0)
-
-	if maxID < 1 {
-		return
-	}
-
-	_, _, ecx1, edx1 := cpuid(1, 0)
-	X86.HasSSE2 = isSet(26, edx1)
-
-	X86.HasSSE3 = isSet(0, ecx1)
-	X86.HasPCLMULQDQ = isSet(1, ecx1)
-	X86.HasSSSE3 = isSet(9, ecx1)
-	X86.HasFMA = isSet(12, ecx1)
-	X86.HasSSE41 = isSet(19, ecx1)
-	X86.HasSSE42 = isSet(20, ecx1)
-	X86.HasPOPCNT = isSet(23, ecx1)
-	X86.HasAES = isSet(25, ecx1)
-	X86.HasOSXSAVE = isSet(27, ecx1)
-
-	osSupportsAVX := false
-	// For XGETBV, OSXSAVE bit is required and sufficient.
-	if X86.HasOSXSAVE {
-		eax, _ := xgetbv()
-		// Check if XMM and YMM registers have OS support.
-		osSupportsAVX = isSet(1, eax) && isSet(2, eax)
-	}
-
-	X86.HasAVX = isSet(28, ecx1) && osSupportsAVX
-
-	if maxID < 7 {
-		return
-	}
-
-	_, ebx7, _, _ := cpuid(7, 0)
-	X86.HasBMI1 = isSet(3, ebx7)
-	X86.HasAVX2 = isSet(5, ebx7) && osSupportsAVX
-	X86.HasBMI2 = isSet(8, ebx7)
-	X86.HasERMS = isSet(9, ebx7)
-	X86.HasADX = isSet(19, ebx7)
-}
-
-func isSet(bitpos uint, value uint32) bool {
-	return value&(1<<bitpos) != 0
-}
diff --git a/vendor/golang.org/x/sys/cpu/cpu_x86.s b/vendor/golang.org/x/sys/cpu/cpu_x86.s
deleted file mode 100644
index 47f0841..0000000
--- a/vendor/golang.org/x/sys/cpu/cpu_x86.s
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build 386 amd64 amd64p32
-// +build !gccgo
-
-#include "textflag.h"
-
-// func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
-TEXT ·cpuid(SB), NOSPLIT, $0-24
-	MOVL eaxArg+0(FP), AX
-	MOVL ecxArg+4(FP), CX
-	CPUID
-	MOVL AX, eax+8(FP)
-	MOVL BX, ebx+12(FP)
-	MOVL CX, ecx+16(FP)
-	MOVL DX, edx+20(FP)
-	RET
-
-// func xgetbv() (eax, edx uint32)
-TEXT ·xgetbv(SB),NOSPLIT,$0-8
-	MOVL $0, CX
-	XGETBV
-	MOVL AX, eax+0(FP)
-	MOVL DX, edx+4(FP)
-	RET