[stubs] Introduce a dedicated FastNewObjectStub.

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 58 matching lines @@
   V(BinaryOpWithAllocationSite)             \
   V(CompareNilIC)                           \
   V(CreateAllocationSite)                   \
   V(CreateWeakCell)                         \
   V(ElementsTransitionAndStore)             \
   V(FastCloneRegExp)                        \
   V(FastCloneShallowArray)                  \
   V(FastCloneShallowObject)                 \
   V(FastNewClosure)                         \
   V(FastNewContext)                         \
+  V(FastNewObject)                          \
   V(FastNewRestParameter)                   \
   V(FastNewSloppyArguments)                 \
   V(FastNewStrictArguments)                 \
   V(GrowArrayElements)                      \
   V(InternalArrayNArgumentsConstructor)     \
   V(InternalArrayNoArgumentConstructor)     \
   V(InternalArraySingleArgumentConstructor) \
   V(KeyedLoadGeneric)                       \
   V(LoadGlobalViaContext)                   \
   V(LoadScriptContextField)                 \
@@ skipping 630 matching lines @@
   static const int kFunction = 0;
 
  private:
   class SlotsBits : public BitField<int, 0, 8> {};
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewContext);
   DEFINE_HYDROGEN_CODE_STUB(FastNewContext, HydrogenCodeStub);
 };
 
 
+class FastNewObjectStub final : public PlatformCodeStub {
+ public:
+  explicit FastNewObjectStub(Isolate* isolate) : PlatformCodeStub(isolate) {}
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewObject);
+  DEFINE_PLATFORM_CODE_STUB(FastNewObject, PlatformCodeStub);
+};
+
+
 // TODO(turbofan): This stub should be possible to write in TurboFan
 // using the CodeStubAssembler very soon in a way that is as efficient
 // and easy as the current handwritten version, which is partly a copy
 // of the strict arguments object materialization code.
 class FastNewRestParameterStub final : public PlatformCodeStub {
  public:
   explicit FastNewRestParameterStub(Isolate* isolate)
       : PlatformCodeStub(isolate) {}
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewRestParameter);
@@ skipping 2217 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_