even more code improvement

R=r
OCL=21160
CL=21160
diff --git a/src/cmd/gc/go.h b/src/cmd/gc/go.h
index 81371f4..858afc1 100644
--- a/src/cmd/gc/go.h
+++ b/src/cmd/gc/go.h
@@ -826,6 +826,7 @@
 void	convlit(Node*, Type*);
 void	evconst(Node*);
 int	cmpslit(Node *l, Node *r);
+int	smallintconst(Node*);
 
 /*
  *	gen.c/gsubr.c/obj.c