Turn StoreIC::Megamorphic into a builtin, get rid of the non-monomorphic-cache

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 335 matching lines @@
   }
 
   MUST_USE_RESULT MaybeHandle<Object> Load(Handle<Object> object,
                                            Handle<Object> key);
 
   // Code generator routines.
   static void GenerateMiss(MacroAssembler* masm);
   static void GenerateRuntimeGetProperty(MacroAssembler* masm);
   static void GenerateMegamorphic(MacroAssembler* masm);
 
-  // Bit mask to be tested against bit field for the cases when
-  // generic stub should go into slow case.
-  // Access check is necessary explicitly since generic stub does not perform
-  // map checks.
-  static const int kSlowCaseBitFieldMask =
-      (1 << Map::kIsAccessCheckNeeded) | (1 << Map::kHasIndexedInterceptor);
-
   static Handle<Code> initialize_stub_in_optimized_code(
       Isolate* isolate, State initialization_state, ExtraICState extra_state);
   static Handle<Code> ChooseMegamorphicStub(Isolate* isolate,
                                             ExtraICState extra_state);
 
   static void Clear(Isolate* isolate, Code* host, KeyedLoadICNexus* nexus);
 
  protected:
   // receiver is HeapObject because it could be a String or a JSObject
   void UpdateLoadElement(Handle<HeapObject> receiver);
@@ skipping 168 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_