all: manual fixups for //go:build vs // +build

Update many generators, also handle files that were not part of the
standard build during 'go fix' in CL 344955.

Fixes #41184.

Change-Id: I1edc684e8101882dcd11f75c6745c266fccfe9e7
Reviewed-on: https://go-review.googlesource.com/c/go/+/359476
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

src/crypto/elliptic/gen_p256_table.go

@@ -26,7 +26,6 @@ func main() {
 // Generated by gen_p256_table.go. DO NOT EDIT.
 
 //go:build amd64 || arm64
-// +build amd64 arm64
 
 package elliptic
 

src/internal/goarch/gengoarch.go

@@ -39,8 +39,7 @@ func main() {
 		}
 		var buf bytes.Buffer
 		fmt.Fprintf(&buf, "// Code generated by gengoarch.go using 'go generate'. DO NOT EDIT.\n\n")
-		fmt.Fprintf(&buf, "//go:build %s\n", target)
-		fmt.Fprintf(&buf, "// +build %s\n\n", target) // must explicitly include target for bootstrapping purposes
+		fmt.Fprintf(&buf, "//go:build %s\n", target) // must explicitly include target for bootstrapping purposes
 		fmt.Fprintf(&buf, "package goarch\n\n")
 		fmt.Fprintf(&buf, "const GOARCH = `%s`\n\n", target)
 		for _, goarch := range goarches {

src/internal/goos/gengoos.go

@@ -51,7 +51,6 @@ func main() {
 		var buf bytes.Buffer
 		fmt.Fprintf(&buf, "// Code generated by gengoos.go using 'go generate'. DO NOT EDIT.\n\n")
 		fmt.Fprintf(&buf, "//go:build %s\n", strings.Join(tags, " && "))
-		fmt.Fprintf(&buf, "// +build %s\n\n", strings.Join(tags, ","))
 		fmt.Fprintf(&buf, "package goos\n\n")
 		fmt.Fprintf(&buf, "const GOOS = `%s`\n\n", target)
 		for _, goos := range gooses {

src/internal/syscall/windows/exec_windows_test.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build windows
-// +build windows
 
 package windows_test
 

src/internal/syscall/windows/mksyscall.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build generate
-// +build generate
 
 package windows
 

src/internal/syscall/windows/registry/export_test.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build windows
-// +build windows
 
 package registry
 

src/internal/syscall/windows/registry/key.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build windows
-// +build windows
 
 // Package registry provides access to the Windows registry.
 //

src/internal/syscall/windows/registry/mksyscall.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build generate
-// +build generate
 
 package registry
 

src/internal/syscall/windows/registry/registry_test.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build windows
-// +build windows
 
 package registry_test
 

src/internal/syscall/windows/registry/syscall.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build windows
-// +build windows
 
 package registry
 

src/internal/syscall/windows/registry/value.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build windows
-// +build windows
 
 package registry
 

src/internal/syscall/windows/sysdll/sysdll.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build windows
-// +build windows
 
 // Package sysdll is an internal leaf package that records and reports
 // which Windows DLL names are used by Go itself. These DLLs are then

src/runtime/asan/asan.go

@@ -3,9 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build asan && linux && (arm64 || amd64)
-// +build asan
-// +build linux
-// +build arm64 amd64
 
 package asan
 

src/runtime/mkduff.go

@@ -179,7 +179,6 @@ func copyARM64(w io.Writer) {
 func tagsPPC64x(w io.Writer) {
 	fmt.Fprintln(w)
 	fmt.Fprintln(w, "//go:build ppc64 || ppc64le")
-	fmt.Fprintln(w, "// +build ppc64 ppc64le")
 	fmt.Fprintln(w)
 }
 
@@ -207,7 +206,6 @@ func copyPPC64x(w io.Writer) {
 func tagsMIPS64x(w io.Writer) {
 	fmt.Fprintln(w)
 	fmt.Fprintln(w, "//go:build mips64 || mips64le")
-	fmt.Fprintln(w, "// +build mips64 mips64le")
 	fmt.Fprintln(w)
 }
 

src/runtime/mkpreempt.go

@@ -123,7 +123,6 @@ func header(arch string) {
 	if beLe[arch] {
 		base := arch[:len(arch)-1]
 		fmt.Fprintf(out, "//go:build %s || %sle\n", base, base)
-		fmt.Fprintf(out, "// +build %s %sle\n\n", base, base)
 	}
 	fmt.Fprintf(out, "#include \"go_asm.h\"\n")
 	fmt.Fprintf(out, "#include \"textflag.h\"\n\n")

src/runtime/msan/msan.go

@@ -3,9 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build msan && linux && (amd64 || arm64)
-// +build msan
-// +build linux
-// +build amd64 arm64
 
 package msan
 

src/runtime/wincallback.go

@@ -22,7 +22,6 @@ func genasm386Amd64() {
 	buf.WriteString(`// Code generated by wincallback.go using 'go generate'. DO NOT EDIT.
 
 //go:build 386 || amd64
-// +build 386 amd64
 
 // runtime·callbackasm is called by external code to
 // execute Go implemented callback function. It is not

src/syscall/js/export_test.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build js && wasm
-// +build js,wasm
 
 package js
 

src/syscall/js/func.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build js && wasm
-// +build js,wasm
 
 package js
 

src/syscall/js/js.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build js && wasm
-// +build js,wasm
 
 // Package js gives access to the WebAssembly host environment when using the js/wasm architecture.
 // Its API is based on JavaScript semantics.

src/syscall/js/js_test.go

@@ -3,7 +3,6 @@
 // license that can be found in the LICENSE file.
 
 //go:build js && wasm
-// +build js,wasm
 
 // To run these tests:
 //