[turbofan] Call FastNewContextStub for function context.

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 1069 matching lines @@
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(
       r.replacement(),
       IsCall(_, IsHeapConstant(
                     CodeFactory::FastCloneShallowObject(isolate(), 6).code()),
              input0, input1, input2, _, context, frame_state, effect, control));
 }
 
 
 // -----------------------------------------------------------------------------
+// JSCreateFunctionContext
+
+
+TEST_F(JSTypedLoweringTest, JSCreateFunctionContextViaInlinedAllocation) {
+  if (!FLAG_turbo_allocate) return;
+  Node* const closure = Parameter(Type::Any());
+  Node* const context = Parameter(Type::Any());
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction const r =
+      Reduce(graph()->NewNode(javascript()->CreateFunctionContext(8), closure,
+                              context, effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(r.replacement(),
+              IsFinish(IsAllocate(IsNumberConstant(Context::SizeFor(
+                                      8 + Context::MIN_CONTEXT_SLOTS)),
+                                  effect, control),
+                       _));
+}
+
+
+TEST_F(JSTypedLoweringTest, JSCreateFunctionContextViaStub) {
+  Node* const closure = Parameter(Type::Any());
+  Node* const context = Parameter(Type::Any());
+  Node* const effect = graph()->start();
+  Node* const control = graph()->start();
+  Reduction const r =
+      Reduce(graph()->NewNode(javascript()->CreateFunctionContext(32), closure,
+                              context, effect, control));
+  ASSERT_TRUE(r.Changed());
+  EXPECT_THAT(r.replacement(),
+              IsCall(_, IsHeapConstant(
+                            CodeFactory::FastNewContext(isolate(), 32).code()),
+                     closure, context, effect, control));
+}
+
+
+// -----------------------------------------------------------------------------
 // JSCreateWithContext
 
 
 TEST_F(JSTypedLoweringTest, JSCreateWithContext) {
-  FLAG_turbo_allocate = true;
+  if (!FLAG_turbo_allocate) return;
   Node* const object = Parameter(Type::Receiver());
   Node* const closure = Parameter(Type::Any());
   Node* const context = Parameter(Type::Any());
   Node* const frame_state = EmptyFrameState();
   Node* const effect = graph()->start();
   Node* const control = graph()->start();
   Reduction r =
       Reduce(graph()->NewNode(javascript()->CreateWithContext(), object,
                               closure, context, frame_state, effect, control));
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(r.replacement(),
               IsFinish(IsAllocate(IsNumberConstant(Context::SizeFor(
                                       Context::MIN_CONTEXT_SLOTS)),
                                   effect, control),
                        _));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8