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

src/builtins.h

 // Copyright 2011 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_BUILTINS_H_
 #define V8_BUILTINS_H_
 
 #include "src/base/flags.h"
 #include "src/handles.h"
 
@@ skipping 229 matching lines @@
   V(LoadIC_Miss, BUILTIN, UNINITIALIZED, kNoExtraICState)                      \
   V(KeyedLoadIC_Miss, BUILTIN, UNINITIALIZED, kNoExtraICState)                 \
   V(StoreIC_Miss, BUILTIN, UNINITIALIZED, kNoExtraICState)                     \
   V(KeyedStoreIC_Miss, BUILTIN, UNINITIALIZED, kNoExtraICState)                \
   V(LoadIC_Getter_ForDeopt, LOAD_IC, MONOMORPHIC, kNoExtraICState)             \
   V(KeyedLoadIC_Megamorphic, KEYED_LOAD_IC, MEGAMORPHIC, kNoExtraICState)      \
                                                                                \
   V(StoreIC_Setter_ForDeopt, STORE_IC, MONOMORPHIC,                            \
     StoreICState::kStrictModeState)                                            \
                                                                                \
+  V(StoreIC_Megamorphic, STORE_IC, MEGAMORPHIC, kNoExtraICState)               \
+  V(StoreIC_Megamorphic_Strict, STORE_IC, MEGAMORPHIC,                         \
+    StoreICState::kStrictModeState)                                            \
+                                                                               \
   V(KeyedStoreIC_Megamorphic, KEYED_STORE_IC, MEGAMORPHIC, kNoExtraICState)    \
-                                                                               \
   V(KeyedStoreIC_Megamorphic_Strict, KEYED_STORE_IC, MEGAMORPHIC,              \
     StoreICState::kStrictModeState)                                            \
                                                                                \
   V(DatePrototypeGetDate, BUILTIN, UNINITIALIZED, kNoExtraICState)             \
   V(DatePrototypeGetDay, BUILTIN, UNINITIALIZED, kNoExtraICState)              \
   V(DatePrototypeGetFullYear, BUILTIN, UNINITIALIZED, kNoExtraICState)         \
   V(DatePrototypeGetHours, BUILTIN, UNINITIALIZED, kNoExtraICState)            \
   V(DatePrototypeGetMilliseconds, BUILTIN, UNINITIALIZED, kNoExtraICState)     \
   V(DatePrototypeGetMinutes, BUILTIN, UNINITIALIZED, kNoExtraICState)          \
   V(DatePrototypeGetMonth, BUILTIN, UNINITIALIZED, kNoExtraICState)            \
@@ skipping 406 matching lines @@
   friend class BuiltinFunctionTable;
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(Builtins);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_H_