re PR tree-optimization/60902 (ffmpeg built with gcc 4.9 RC produces incorrect flac playback code)

	PR tree-optimization/60902
	* tree-ssa-threadedge.c
	(record_temporary_equivalences_from_stmts_at_dest): Only iterate
	over real defs when invalidating outputs from statements that do not
	produce useful outputs for threading.

From-SVN: r209860

gcc/ChangeLog

+2014-04-28  Jeff Law  <law@redhat.com>
+
+	PR tree-optimization/60902
+	* tree-ssa-threadedge.c
+	(record_temporary_equivalences_from_stmts_at_dest): Only iterate
+	over real defs when invalidating outputs from statements that do not
+	produce useful outputs for threading.
+
 2014-04-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/60979

gcc/tree-ssa-threadedge.c

@@ -398,7 +398,7 @@ record_temporary_equivalences_from_stmts_at_dest (edge e,
 	  ssa_op_iter iter;
 
 	  if (backedge_seen)
-	    FOR_EACH_SSA_TREE_OPERAND (op, stmt, iter, SSA_OP_ALL_DEFS)
+	    FOR_EACH_SSA_TREE_OPERAND (op, stmt, iter, SSA_OP_DEF)
 	      {
 		/* This call only invalidates equivalences created by
 		   PHI nodes.  This is by design to keep the cost of