Introduce {FAST,SLOW}_STRING_WRAPPER_ELEMENTS

src/code-stubs.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_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 2707 matching lines @@
   DEFINE_HYDROGEN_CODE_STUB(InternalArrayNArgumentsConstructor,
                             InternalArrayConstructorStubBase);
 };
 
 
 class StoreElementStub : public PlatformCodeStub {
  public:
   StoreElementStub(Isolate* isolate, ElementsKind elements_kind,
                    KeyedAccessStoreMode mode)
       : PlatformCodeStub(isolate) {
+    // TODO(jkummerow): Rename this stub to StoreSlowElementStub,
+    // drop elements_kind parameter.
+    DCHECK_EQ(DICTIONARY_ELEMENTS, elements_kind);
     minor_key_ = ElementsKindBits::encode(elements_kind) |
                  CommonStoreModeBits::encode(mode);
   }
 
   CallInterfaceDescriptor GetCallInterfaceDescriptor() const override {
     return VectorStoreICDescriptor(isolate());
   }
 
   Code::Kind GetCodeKind() const override { return Code::HANDLER; }
 
@@ skipping 246 matching lines @@
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 
 extern Representation RepresentationFromType(Type* type);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODE_STUBS_H_