cmd/compile/internal/gc: remove toolstash hacks

Change-Id: I221f77075a25e934e20b41307758a89c19169e05
Reviewed-on: https://go-review.googlesource.com/c/145201Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

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

@@ -1102,7 +1102,6 @@ func (w *exportWriter) stmt(n *Node) {
 	case OGOTO, OLABEL:
 		w.op(op)
 		w.pos(n.Pos)
-		w.op(ONAME) // TODO(mdempsky): Remove toolstash hack.
 		w.string(n.Sym.Name)
 
 	default:

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

@@ -1044,9 +1044,6 @@ func (r *importReader) node() *Node {
 
 	case OGOTO, OLABEL:
 		n := nodl(r.pos(), op, nil, nil)
-		if op := r.op(); op != ONAME { // TODO(mdempsky): Remove toolstash check.
-			Fatalf("got %v, want ONAME", op)
-		}
 		n.Sym = lookup(r.string())
 		return n