Lithium: avoid registers for constants when possible.

src/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 1476 matching lines @@
 
 
 HInstruction* HGraphBuilder::BuildStoreMap(HValue* object,
                                            HValue* map) {
   Zone* zone = this->zone();
   Factory* factory = isolate()->factory();
   Handle<String> map_field_name = factory->map_field_string();
   HInstruction* store_map =
       new(zone) HStoreNamedField(object, map_field_name, map,
                                  true, JSObject::kMapOffset);
+  store_map->ClearGVNFlag(kChangesInobjectFields);
   store_map->SetGVNFlag(kChangesMaps);
   AddInstruction(store_map);
   return store_map;
 }
 
 
 HInstruction* HGraphBuilder::BuildStoreMap(HValue* object,
                                            Handle<Map> map) {
   Zone* zone = this->zone();
   HValue* map_constant =
@@ skipping 10668 matching lines @@
     }
   }
 
 #ifdef DEBUG
   if (graph_ != NULL) graph_->Verify(false);  // No full verify.
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 } }  // namespace v8::internal