cmd/compile: move Node.Pack to Node.Name.Pack

$ sizeof -p cmd/compile/internal/gc Node
Node 232
$

Change-Id: I4be025f4ec11f882f24ae7582821d36d3b122b77
Reviewed-on: https://go-review.googlesource.com/10526
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/src/cmd/compile/internal/gc/subr.go b/src/cmd/compile/internal/gc/subr.go
index 4dd8b29..dc85dc4 100644
--- a/src/cmd/compile/internal/gc/subr.go
+++ b/src/cmd/compile/internal/gc/subr.go
@@ -331,7 +331,10 @@
 
 		s1.Def = s.Def
 		s1.Block = s.Block
-		s1.Def.Pack = pack
+		if s1.Def.Name == nil {
+			Dump("s1def", s1.Def)
+		}
+		s1.Def.Name.Pack = pack
 		s1.Origpkg = opkg
 		n++
 	}