cmd/dist, go/types: add support for GOARCH=sparc64

This is needed in addition to CL 102555 in order to be able to generate
Go type definitions for linux/sparc64 in the golang.org/x/sys/unix
package.

Change-Id: I928185e320572fecb0c89396f871ea16cba8b9a6
Reviewed-on: https://go-review.googlesource.com/132155
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/dist/build.go

@@ -69,6 +69,7 @@ var okgoarch = []string{
 	"ppc64le",
 	"riscv64",
 	"s390x",
+	"sparc64",
 	"wasm",
 }
 
@@ -1407,6 +1408,7 @@ var cgoEnabled = map[string]bool{
 	"linux/mips64le":  true,
 	"linux/riscv64":   true,
 	"linux/s390x":     true,
+	"linux/sparc64":   true,
 	"android/386":     true,
 	"android/amd64":   true,
 	"android/arm":     true,

src/cmd/vet/all/main.go

@@ -192,9 +192,9 @@ func vetPlatforms(pp []platform) {
 }
 
 func (p platform) vet() {
-	if p.os == "linux" && p.arch == "riscv64" {
-		// TODO(tklauser): enable as soon as the riscv64 port has fully landed
-		fmt.Println("skipping linux/riscv64")
+	if p.os == "linux" && (p.arch == "riscv64" || p.arch == "sparc64") {
+		// TODO(tklauser): enable as soon as these ports have fully landed
+		fmt.Printf("skipping %s/%s\n", p.os, p.arch)
 		return
 	}
 

src/go/types/sizes.go

@@ -169,6 +169,7 @@ var gcArchSizes = map[string]*StdSizes{
 	"ppc64le":  {8, 8},
 	"riscv64":  {8, 8},
 	"s390x":    {8, 8},
+	"sparc64":  {8, 8},
 	"wasm":     {8, 8},
 	// When adding more architectures here,
 	// update the doc string of SizesFor below.
@@ -179,7 +180,7 @@ var gcArchSizes = map[string]*StdSizes{
 //
 // Supported architectures for compiler "gc":
 // "386", "arm", "arm64", "amd64", "amd64p32", "mips", "mipsle",
-// "mips64", "mips64le", "ppc64", "ppc64le", "riscv64", "s390x", "wasm".
+// "mips64", "mips64le", "ppc64", "ppc64le", "riscv64", "s390x", "sparc64", "wasm".
 func SizesFor(compiler, arch string) Sizes {
 	if compiler != "gc" {
 		return nil