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

src/builtins.h

Index: src/builtins.h
diff --git a/src/builtins.h b/src/builtins.h
index 294929a290189691014ea048fb1af2a669e22ea5..75761edfaeeb05e69ce06f073c558275791ac230 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -247,8 +247,11 @@ inline bool operator&(BuiltinExtraArguments lhs, BuiltinExtraArguments rhs) {
   V(StoreIC_Setter_ForDeopt, STORE_IC, MONOMORPHIC,                            \
     StoreICState::kStrictModeState)                                            \
                                                                                \
-  V(KeyedStoreIC_Megamorphic, KEYED_STORE_IC, MEGAMORPHIC, kNoExtraICState)    \
+  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)                                            \
                                                                                \