cmd/compile: rename (*Type).HasPointer to (*Type).HasHeapPointer

This method indicates whether a type contains any *heap* pointers, not
just whether it contains any pointers. Rename the method to make this
clear.

Change-Id: Ifff143e2f02a820444ac26b84250495c0098cb33
Reviewed-on: https://go-review.googlesource.com/67690
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

src/cmd/compile/internal/ssa/writebarrier.go

@@ -17,7 +17,7 @@ func needwb(v *Value) bool {
 	if !ok {
 		v.Fatalf("store aux is not a type: %s", v.LongString())
 	}
-	if !t.HasPointer() {
+	if !t.HasHeapPointer() {
 		return false
 	}
 	if IsStackAddr(v.Args[0]) {

src/cmd/compile/internal/types/type.go

@@ -1391,10 +1391,10 @@ func Haspointers(t *Type) bool {
 	return true
 }
 
-// HasPointer returns whether t contains heap pointer.
+// HasHeapPointer returns whether t contains a heap pointer.
 // This is used for write barrier insertion, so we ignore
 // pointers to go:notinheap types.
-func (t *Type) HasPointer() bool {
+func (t *Type) HasHeapPointer() bool {
 	if t.IsPtr() && t.Elem().NotInHeap() {
 		return false
 	}