re PR lto/54312 (uniquify_nodes takes 12% of Mozilla LTO build)

	PR lto/54312
	* lto.c (uniquify_nodes): Remove quadratic loop checking if the
	type is variant leader.

From-SVN: r191228

gcc/lto/ChangeLog

+2012-09-11  Jan Hubicka  <jh@suse.cz>
+
+	PR lto/54312
+	* lto.c (uniquify_nodes): Remove quadratic loop checking if the
+	type is variant leader.
+
 2012-09-11  Richard Guenther  <rguenther@suse.de>
 
 	* lto.c (enum gtc_mode): Remove.

gcc/lto/lto.c

@@ -1850,6 +1850,7 @@ uniquify_nodes (struct data_in *data_in, unsigned from)
 	     variant list state before fixup is broken.  */
 	  tree tem, mv;
 
+#ifdef ENABLE_CHECKING
 	  /* Remove us from our main variant list if we are not the
 	     variant leader.  */
 	  if (TYPE_MAIN_VARIANT (t) != t)
@@ -1857,10 +1858,9 @@ uniquify_nodes (struct data_in *data_in, unsigned from)
 	      tem = TYPE_MAIN_VARIANT (t);
 	      while (tem && TYPE_NEXT_VARIANT (tem) != t)
 		tem = TYPE_NEXT_VARIANT (tem);
-	      if (tem)
-		TYPE_NEXT_VARIANT (tem) = TYPE_NEXT_VARIANT (t);
-	      TYPE_NEXT_VARIANT (t) = NULL_TREE;
+	      gcc_assert (!tem && !TYPE_NEXT_VARIANT (t));
 	    }
+#endif
 
 	  /* Query our new main variant.  */
 	  mv = GIMPLE_REGISTER_TYPE (TYPE_MAIN_VARIANT (t));