cmd/gc: fix 'make' in cmd/gc directory

Right now, go tool 6g -A fails complaining about 'any' type.

TBR=r
CC=golang-codereviews
https://golang.org/cl/156200044

src/cmd/gc/pgen.c

@@ -182,6 +182,8 @@ compile(Node *fn)
 			yyerror("missing function body", fn);
 			goto ret;
 		}
+		if(debug['A'])
+			goto ret;
 		emitptrargsmap();
 		goto ret;
 	}