cmd/compile: don't clear ptrmask in fillptrmask

It is only ever called with a newly allocated slice.

This clearing code dates back to the C version of the compiler,
in which the function started like this:

static void
gengcmask(Type *t, uint8 gcmask[16])
{
	...

	memset(gcmask, 0, 16);
	if(!haspointers(t))
		return;

That memset was required for C, but not for Go.

Change-Id: I6fceb99b2dc8682685dca2e4289fcd58e2e5a0e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/718340
LUCI-TryBot-Result: Go LUCI <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
Reviewed-by: Keith Randall <[email protected]>
Reviewed-by: Junyang Shao <[email protected]>

Author: ianlancetaylor

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

@@ -1282,7 +1282,6 @@ func dgcptrmask(t *types.Type, write bool) *obj.LSym {
 // word offsets in t that hold pointers.
 // ptrmask is assumed to fit at least types.PtrDataSize(t)/PtrSize bits.
 func fillptrmask(t *types.Type, ptrmask []byte) {
-	clear(ptrmask)
 	if !t.HasPointers() {
 		return
 	}