Avoid index rebuild for no-rewrite ALTER TABLE .. ALTER TYPE.

Noah Misch.  Review and minor cosmetic changes by me.

src/include/utils/relcache.h

@@ -67,6 +67,7 @@ extern Relation RelationBuildLocalRelation(const char *relname,
 						   Oid relnamespace,
 						   TupleDesc tupDesc,
 						   Oid relid,
+						   Oid relfilenode,
 						   Oid reltablespace,
 						   bool shared_relation,
 						   bool mapped_relation,