Merge r8780, r8803 from the bleeding edge 3.4 branch.

src/hydrogen.cc

Index: src/hydrogen.cc
===================================================================
--- src/hydrogen.cc	(revision 8804)
+++ src/hydrogen.cc	(working copy)
@@ -2304,11 +2304,11 @@
 
   graph()->OrderBlocks();
   graph()->AssignDominators();
+  graph()->EliminateRedundantPhis();
   if (!graph()->CheckPhis()) {
     Bailout("Unsupported phi use of arguments object");
     return NULL;
   }
-  graph()->EliminateRedundantPhis();
   if (FLAG_eliminate_dead_phis) graph()->EliminateUnreachablePhis();
   if (!graph()->CollectPhis()) {
     Bailout("Unsupported phi use of uninitialized constant");