bug: compiler crash on select receive without variable.

R=gri
OCL=13470
CL=13470

test/bugs/bug078.go

+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+func dosplit(wait *chan int ){
+	select {
+	case <-wait:
+	}
+}
+
+func main() {
+}