[runtime] Migrate several Date builtins to C++.

src/runtime/runtime-object.cc

 // Copyright 2014 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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/bootstrapper.h"
 #include "src/debug/debug.h"
 #include "src/isolate-inl.h"
@@ skipping 777 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(Runtime_AllocateHeapNumber) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   return *isolate->factory()->NewHeapNumber(0);
 }
 
 
-static Object* Runtime_NewObjectHelper(Isolate* isolate,
-                                       Handle<JSFunction> constructor,
-                                       Handle<JSReceiver> new_target,
-                                       Handle<AllocationSite> site) {
-  DCHECK(constructor->IsConstructor());
-
-  // If called through new, new.target can be:
-  // - a subclass of constructor,
-  // - a proxy wrapper around constructor, or
-  // - the constructor itself.
-  // If called through Reflect.construct, it's guaranteed to be a constructor by
-  // REFLECT_CONSTRUCT_PREPARE.
-  DCHECK(new_target->IsConstructor());
-
-  DCHECK(!constructor->has_initial_map() ||
-         constructor->initial_map()->instance_type() != JS_FUNCTION_TYPE);
-
-  Handle<Map> initial_map;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
-      isolate, initial_map,
-      JSFunction::GetDerivedMap(isolate, constructor, new_target));
-
-  Handle<JSObject> result =
-      isolate->factory()->NewJSObjectFromMap(initial_map, NOT_TENURED, site);
-
-  isolate->counters()->constructed_objects()->Increment();
-  isolate->counters()->constructed_objects_runtime()->Increment();
-
-  return *result;
-}
-
-
 RUNTIME_FUNCTION(Runtime_NewObject) {
   HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  CONVERT_ARG_HANDLE_CHECKED(JSFunction, constructor, 0);
+  DCHECK_EQ(2, args.length());
+  CONVERT_ARG_HANDLE_CHECKED(JSFunction, target, 0);
   CONVERT_ARG_HANDLE_CHECKED(JSReceiver, new_target, 1);
-
-  return Runtime_NewObjectHelper(isolate, constructor, new_target,
-                                 Handle<AllocationSite>::null());
+  Handle<JSObject> result;
+  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result,
+                                     JSObject::New(target, new_target));
+  return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_FinalizeInstanceSize) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
 
   CONVERT_ARG_HANDLE_CHECKED(Map, initial_map, 0);
   initial_map->CompleteInobjectSlackTracking();
 
@@ skipping 501 matching lines @@
   DCHECK(args.length() == 2);
   CONVERT_ARG_HANDLE_CHECKED(Object, o, 0);
   CONVERT_ARG_HANDLE_CHECKED(Object, properties, 1);
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, o, JSReceiver::DefineProperties(isolate, o, properties));
   return *o;
 }
 
 }  // namespace internal
 }  // namespace v8