shift for non-64 bit integers.

R=rsc
http://go/go-review/1015017
diff --git a/src/cmd/8g/ggen.c b/src/cmd/8g/ggen.c
index 3f535cf..99c8b78 100644
--- a/src/cmd/8g/ggen.c
+++ b/src/cmd/8g/ggen.c
@@ -627,7 +627,7 @@
 	uvlong sc;
 
 	if(nl->type->width > 4)
-		fatal("cgen_shift %T", nl->type->width);
+		fatal("cgen_shift %T", nl->type);
 
 	w = nl->type->width * 8;