[cleanup] Drop handwritten KeyedStoreIC code

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/ic/ic-state.h"
 #include "src/macro-assembler.h"
 #include "src/messages.h"
@@ skipping 433 matching lines @@
   MUST_USE_RESULT MaybeHandle<Object> Store(Handle<Object> object,
                                             Handle<Object> name,
                                             Handle<Object> value);
 
   // Code generators for stub routines.  Only called once at startup.
   static void GenerateMiss(MacroAssembler* masm);
   static void GenerateSlow(MacroAssembler* masm);
   static void GenerateMegamorphic(MacroAssembler* masm,
                                   LanguageMode language_mode);
 
-  static Handle<Code> ChooseMegamorphicStub(Isolate* isolate,
-                                            ExtraICState extra_state);
-
   static void Clear(Isolate* isolate, Code* host, KeyedStoreICNexus* nexus);
 
  protected:
   void UpdateStoreElement(Handle<Map> receiver_map,
                           KeyedAccessStoreMode store_mode);
 
  private:
   Handle<Map> ComputeTransitionedMap(Handle<Map> map,
                                      KeyedAccessStoreMode store_mode);
 
@@ skipping 50 matching lines @@
 
 // Helper for BinaryOpIC and CompareIC.
 enum InlinedSmiCheck { ENABLE_INLINED_SMI_CHECK, DISABLE_INLINED_SMI_CHECK };
 void PatchInlinedSmiCode(Isolate* isolate, Address address,
                          InlinedSmiCheck check);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_IC_H_