[dev.typeparams] runtime/internal/sys: replace uses of GOARCH with goarch.GOARCH

Refactoring performed by the rf tool:

    rf 'ex . {
	import "internal/goarch"
	import "runtime/internal/sys"
	sys.GOARCH -> goarch.GOARCH
    }'

Change-Id: I4b0246bf4e734f08313c6fff7b547db362057714
Reviewed-on: https://go-review.googlesource.com/c/go/+/328338
Trust: Michael Knyszek <mknyszek@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

src/runtime/extern.go

@@ -186,7 +186,10 @@ of the run-time system.
 */
 package runtime
 
-import "runtime/internal/sys"
+import (
+	"internal/goarch"
+	"runtime/internal/sys"
+)
 
 // Caller reports file and line number information about function invocations on
 // the calling goroutine's stack. The argument skip is the number of stack frames
@@ -264,4 +267,4 @@ const GOOS string = sys.GOOS
 
 // GOARCH is the running program's architecture target:
 // one of 386, amd64, arm, s390x, and so on.
-const GOARCH string = sys.GOARCH
+const GOARCH string = goarch.GOARCH

src/runtime/heapdump.go

@@ -12,7 +12,6 @@
 package runtime
 
 import (
-	"runtime/internal/sys"
 	"internal/goarch"
 	"unsafe"
 )
@@ -532,7 +531,7 @@ func dumpparams() {
 	}
 	dumpint(uint64(arenaStart))
 	dumpint(uint64(arenaEnd))
-	dumpstr(sys.GOARCH)
+	dumpstr(goarch.GOARCH)
 	dumpstr(buildVersion)
 	dumpint(uint64(ncpu))
 }

src/runtime/internal/sys/consts.go

@@ -54,8 +54,6 @@ const MinFrameSize = goarch.MinFrameSize
 // The stack must be at least word aligned, but some architectures require more.
 const StackAlign = goarch.StackAlign
 
-const GOARCH = goarch.GOARCH
-
 const (
 	Goarch386         = goarch.Goarch386
 	GoarchAmd64       = goarch.GoarchAmd64