Foundation for the use of informative definitions in Crankshaft.

src/code-stubs-hydrogen.cc

Index: src/code-stubs-hydrogen.cc
diff --git a/src/code-stubs-hydrogen.cc b/src/code-stubs-hydrogen.cc
index 58e17f43f2adf7f98883e97db94b7297710949cb..229df8c433581f72d72b588027c66506dc3a7ace 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -40,7 +40,7 @@ Handle<Code> HydrogenCodeStub::CodeFromGraph(HGraph* graph) {
   graph->AssignDominators();
   graph->CollectPhis();
   graph->InsertRepresentationChanges();
-  graph->EliminateRedundantBoundsChecks();
+  graph->RestoreActualValues();
   LChunk* chunk = LChunk::NewChunk(graph);
   ASSERT(chunk != NULL);
   Handle<Code> stub = chunk->Codegen(Code::COMPILED_STUB);
@@ -123,7 +123,8 @@ void CodeStubGraphBuilder<KeyedLoadFastElementStub>::BuildCodeStub() {
 
   HInstruction* load = BuildUncheckedMonomorphicElementAccess(
       GetParameter(0), GetParameter(1), NULL, NULL,
-      casted_stub()->is_js_array(), casted_stub()->elements_kind(), false);
+      casted_stub()->is_js_array(), casted_stub()->elements_kind(),
+      false, Representation::Tagged());
   AddInstruction(load);
 
   HReturn* ret = new(zone) HReturn(load, context());