[turbofan] Lower JSCreate to an inline allocation in JSTypedLowering.

test/unittests/compiler/js-typed-lowering-unittest.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/code-factory.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/js-typed-lowering.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 961 matching lines @@
     EXPECT_THAT(r.replacement(),
                 IsCall(_, IsHeapConstant(CodeFactory::StringAdd(
                                              isolate(), STRING_ADD_CHECK_NONE,
                                              NOT_TENURED).code()),
                        lhs, rhs, context, frame_state0, effect, control));
   }
 }
 
 
 // -----------------------------------------------------------------------------
+// JSCreate
+
+
+TEST_F(JSTypedLoweringTest, JSCreate) {
+  Handle<JSFunction> function = isolate()->object_function();
+  Node* const target = Parameter(Type::Constant(function, graph()->zone()));
+  Node* const context = Parameter(Type::Any());
+  Node* const effect = graph()->start();
+  Reduction r = Reduce(graph()->NewNode(javascript()->Create(), target, target,
+                                        context, effect));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(
+      r.replacement(),
+      IsFinishRegion(
+          IsAllocate(IsNumberConstant(function->initial_map()->instance_size()),
+                     IsBeginRegion(effect), _),
+          _));
+}
+
+
+// -----------------------------------------------------------------------------
 // JSCreateArguments
 
 
 TEST_F(JSTypedLoweringTest, JSCreateArgumentsViaStub) {
   Node* const closure = Parameter(Type::Any());
   Node* const context = UndefinedConstant();
   Node* const effect = graph()->start();
   Node* const control = graph()->start();
   Handle<SharedFunctionInfo> shared(isolate()->object_function()->shared());
   Node* const frame_state = FrameState(shared, graph()->start());
@@ skipping 240 matching lines @@
   Node* dummy = graph()->NewNode(javascript()->ToObject(), instanceOf, context,
                                  frame_state, effect, control);
   Reduction r = Reduce(instanceOf);
   ASSERT_FALSE(r.Changed());
   ASSERT_EQ(instanceOf, dummy->InputAt(0));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8