[builtins] Add EmitFastNewObject

src/builtins/builtins-constructor.h

 // Copyright 2016 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.
 
 #include "src/code-stub-assembler.h"
 
 namespace v8 {
 namespace internal {
 
 typedef compiler::Node Node;
@@ skipping 26 matching lines @@
       AllocationSiteMode allocation_site_mode);
 
   // Maximum number of properties in copied objects.
   static const int kMaximumClonedShallowObjectProperties = 6;
   static int FastCloneShallowObjectPropertiesCount(int literal_length);
   Node* EmitFastCloneShallowObject(CodeAssemblerLabel* call_runtime,
                                    Node* closure, Node* literals_index,
                                    Node* properties_count);
   void CreateFastCloneShallowObjectBuiltin(int properties_count);
 
+  Node* EmitFastNewObject(Node* context, Node* target, Node* new_target);
+
+  Node* EmitFastNewObject(Node* context, Node* target, Node* new_target,
+                          CodeAssemblerLabel* call_runtime);
+
  private:
   static const int kMaximumSlots = 0x8000;
   static const int kSmallMaximumSlots = 10;
 
   Node* NonEmptyShallowClone(Node* boilerplate, Node* boilerplate_map,
                              Node* boilerplate_elements, Node* allocation_site,
                              Node* capacity, ElementsKind kind);
 
   // FastNewFunctionContext can only allocate closures which fit in the
   // new space.
   STATIC_ASSERT(((kMaximumSlots + Context::MIN_CONTEXT_SLOTS) * kPointerSize +
                  FixedArray::kHeaderSize) < kMaxRegularHeapObjectSize);
 };
 
 }  // namespace internal
 }  // namespace v8