Mark HCompareMap as having Tagged representation

src/hydrogen-instructions.h

 // 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 1599 matching lines @@
               HBasicBlock* false_target = NULL)
       : HUnaryControlInstruction(value, true_target, false_target),
         known_successor_index_(kNoKnownSuccessorIndex), map_(Unique<Map>(map)) {
     ASSERT(!map.is_null());
     is_stable_ = map->is_stable();
 
     if (is_stable_) {
       map->AddDependentCompilationInfo(
           DependentCode::kPrototypeCheckGroup, info);
     }
+    set_representation(Representation::Tagged());
   }
 
   int known_successor_index_;
   bool is_stable_;
   Unique<Map> map_;
 };
 
 
 class HContext V8_FINAL : public HTemplateInstruction<0> {
  public:
@@ skipping 5889 matching lines @@
   virtual bool IsDeletable() const V8_OVERRIDE { return true; }
 };
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_