Eliminate map checks of constant values.

src/code-stubs-hydrogen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 835 matching lines @@
   Handle<Object> placeholer_value(Smi::FromInt(0), isolate());
   Handle<PropertyCell> placeholder_cell =
       isolate()->factory()->NewPropertyCell(placeholer_value);
 
   HParameter* receiver = GetParameter(0);
   HParameter* value = GetParameter(2);
 
   // Check that the map of the global has not changed: use a placeholder map
   // that will be replaced later with the global object's map.
   Handle<Map> placeholder_map = isolate()->factory()->meta_map();
-  AddInstruction(HCheckMaps::New(receiver, placeholder_map, zone()));
+  AddInstruction(HCheckMaps::New(
+      receiver, placeholder_map, zone(), top_info()));
 
   HValue* cell = Add<HConstant>(placeholder_cell, Representation::Tagged());
   HObjectAccess access(HObjectAccess::ForCellPayload(isolate()));
   HValue* cell_contents = Add<HLoadNamedField>(cell, access);
 
   if (stub->is_constant()) {
     IfBuilder builder(this);
     builder.If<HCompareObjectEqAndBranch>(cell_contents, value);
     builder.Then();
     builder.ElseDeopt();
@@ skipping 50 matching lines @@
   return value;
 }
 
 
 Handle<Code> ElementsTransitionAndStoreStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 
 } }  // namespace v8::internal