cmd/compile: s/eqtype/types.Identical/ (fix build)

TBR=khr

Change-Id: Ia5a08f1acd9f37c466829754990733330264f546
Reviewed-on: https://go-review.googlesource.com/c/143758Reviewed-by: Robert Griesemer <gri@golang.org>

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

@@ -2895,7 +2895,7 @@ func walkappend(n *Node, init *Nodes, dst *Node) *Node {
 	ls := n.List.Slice()[1:]
 	for i, n := range ls {
 		n = cheapexpr(n, init)
-		if !eqtype(n.Type, nsrc.Type.Elem()) {
+		if !types.Identical(n.Type, nsrc.Type.Elem()) {
 			n = assignconv(n, nsrc.Type.Elem(), "append")
 			n = walkexpr(n, init)
 		}