Encapsulate megamorphic load/tail-call in hydrogen

src/ic/ic.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_IC_H_
 #define V8_IC_H_
 
 #include "src/macro-assembler.h"
 
 namespace v8 {
@@ skipping 387 matching lines @@
       return false;
     }
   }
 
   // Code generator routines.
   static void GenerateInitialize(MacroAssembler* masm) { GenerateMiss(masm); }
   static void GeneratePreMonomorphic(MacroAssembler* masm) {
     GenerateMiss(masm);
   }
   static void GenerateMiss(MacroAssembler* masm);
-  static void GenerateMegamorphic(MacroAssembler* masm);
   static void GenerateNormal(MacroAssembler* masm);
   static void GenerateRuntimeGetProperty(MacroAssembler* masm);
 
   static Handle<Code> initialize_stub(Isolate* isolate,
                                       ExtraICState extra_state);
 
   MUST_USE_RESULT MaybeHandle<Object> Load(Handle<Object> object,
                                            Handle<Name> name);
 
  protected:
@@ skipping 508 matching lines @@
 
 // Support functions for interceptor handlers.
 DECLARE_RUNTIME_FUNCTION(LoadPropertyWithInterceptorOnly);
 DECLARE_RUNTIME_FUNCTION(LoadPropertyWithInterceptor);
 DECLARE_RUNTIME_FUNCTION(LoadElementWithInterceptor);
 DECLARE_RUNTIME_FUNCTION(StorePropertyWithInterceptor);
 }
 }  // namespace v8::internal
 
 #endif  // V8_IC_H_