runtime/debug: skip TestFreeOSMemory for mips64{,le}

Change-Id: I419f3b8bf1bddffd4a775b0cd7b98f0239fe19cb
Reviewed-on: https://go-review.googlesource.com/14458Reviewed-by: Minux Ma <minux@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/runtime/debug/garbage_test.go

@@ -88,7 +88,7 @@ func TestReadGCStats(t *testing.T) {
 var big = make([]byte, 1<<20)
 
 func TestFreeOSMemory(t *testing.T) {
-	if runtime.GOARCH == "arm64" || runtime.GOARCH == "ppc64" || runtime.GOARCH == "ppc64le" ||
+	if runtime.GOARCH == "arm64" || runtime.GOARCH == "ppc64" || runtime.GOARCH == "ppc64le" || runtime.GOARCH == "mips64" || runtime.GOARCH == "mips64le" ||
 		runtime.GOOS == "nacl" {
 		t.Skip("issue 9993; scavenger temporarily disabled on systems with physical pages larger than logical pages")
 	}