gc: compactframe breaks arm - fix build

R=lvd
CC=golang-dev
https://golang.org/cl/4591063

src/cmd/gc/pgen.c

@@ -111,6 +111,7 @@ compile(Node *fn)
 	}
 
 	oldstksize = stksize;
+	if(thechar != '5')
 		compactframe(ptxt);
 	if(0)
 		print("compactframe: %ld to %ld\n", oldstksize, stksize);