[turbofan] Add SimplifiedOperator::Allocate operator.

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 949 matching lines @@
       input0, input1, input2, context, frame_state, effect, control));
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(
       r.replacement(),
       IsCall(_, IsHeapConstant(Unique<HeapObject>::CreateImmovable(
                     CodeFactory::FastCloneShallowObject(isolate(), 6).code())),
              input0, input1, input2, _, context, frame_state, effect, control));
 }
 #endif
 
+
+// -----------------------------------------------------------------------------
+// JSCreateWithContext
+
+
+TEST_F(JSTypedLoweringTest, JSCreateWithContext) {
+  FLAG_turbo_allocate = true;
+  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