Replace HCheckPrototypeMaps by explicit map checks of constant values.

src/hydrogen.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 1544 matching lines @@
   void BuildCompareNil(
       HValue* value,
       Handle<Type> type,
       int position,
       HIfContinuation* continuation);
 
   HValue* BuildCreateAllocationMemento(HValue* previous_object,
                                        int previous_object_size,
                                        HValue* payload);
 
+  void BuildConstantMapCheck(Handle<JSObject> constant, CompilationInfo* info);
+  void BuildCheckPrototypeMaps(Handle<JSObject> prototype,
+                               Handle<JSObject> holder);
+
   HInstruction* BuildGetNativeContext();
   HInstruction* BuildGetArrayFunction();
 
  private:
   HGraphBuilder();
 
   void PadEnvironmentForContinuation(HBasicBlock* from,
                                      HBasicBlock* continuation);
 
   CompilationInfo* info_;
@@ skipping 750 matching lines @@
   EmbeddedVector<char, 64> filename_;
   HeapStringAllocator string_allocator_;
   StringStream trace_;
   int indent_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_