cmd/compile: simplify check for pointers in map bucket

Change-Id: Ie5e977c54f50274421962a7ca268ae71a6f19cef
Reviewed-on: https://go-review.googlesource.com/60050
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>

src/cmd/compile/internal/gc/reflect.go

@@ -157,7 +157,7 @@ func mapbucket(t *types.Type) *types.Type {
 	// the type of the overflow field to uintptr in this case.
 	// See comment on hmap.overflow in ../../../../runtime/hashmap.go.
 	otyp := types.NewPtr(bucket)
-	if !types.Haspointers(t.Val()) && !types.Haspointers(t.Key()) && t.Val().Width <= MAXVALSIZE && t.Key().Width <= MAXKEYSIZE {
+	if !types.Haspointers(valtype) && !types.Haspointers(keytype) {
 		otyp = types.Types[TUINTPTR]
 	}
 	overflow := makefield("overflow", otyp)