Count closures using the feedback vector cell map, specialize if count==1.

test/unittests/compiler/js-create-lowering-unittest.cc

 // 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/compiler/js-create-lowering.h"
 #include "src/code-factory.h"
 #include "src/compilation-dependencies.h"
 #include "src/compiler/access-builder.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/js-operator.h"
@@ skipping 124 matching lines @@
   Reduction r = Reduce(graph()->NewNode(
       javascript()->CreateArguments(CreateArgumentsType::kRestParameter),
       closure, context, frame_state_inner, effect));
   ASSERT_TRUE(r.Changed());
   EXPECT_THAT(
       r.replacement(),
       IsFinishRegion(IsAllocate(IsNumberConstant(JSArray::kSize), _, _), _));
 }
 
 // -----------------------------------------------------------------------------
-// JSCreateClosure
-
-TEST_F(JSCreateLoweringTest, JSCreateClosureViaInlinedAllocation) {
-  if (!FLAG_turbo_lower_create_closure) return;
-  Node* const context = UndefinedConstant();
-  Node* const effect = graph()->start();
-  Node* const control = graph()->start();
-  Handle<SharedFunctionInfo> shared(isolate()->number_function()->shared());
-
-  // Create a mock feedback vector. It just has to be an array with an array
-  // in slot 0.
-  Handle<FixedArray> array = isolate()->factory()->NewFixedArray(
-      FeedbackVector::kReservedIndexCount + 1);
-  array->set_map_no_write_barrier(isolate()->heap()->feedback_vector_map());
-  Handle<FeedbackVector> vector = Handle<FeedbackVector>::cast(array);
-  FeedbackSlot slot(0);
-  vector->Set(slot, *vector);
-  VectorSlotPair pair(vector, slot);
-
-  Reduction r = Reduce(
-      graph()->NewNode(javascript()->CreateClosure(shared, pair, NOT_TENURED),
-                       context, effect, control));
-  ASSERT_TRUE(r.Changed());
-  EXPECT_THAT(r.replacement(),
-              IsFinishRegion(IsAllocate(IsNumberConstant(JSFunction::kSize),
-                                        IsBeginRegion(_), control),
-                             _));
-}
-
-// -----------------------------------------------------------------------------
 // JSCreateFunctionContext
 
 TEST_F(JSCreateLoweringTest, JSCreateFunctionContextViaInlinedAllocation) {
   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, FUNCTION_SCOPE),
                        closure, context, effect, control));
@@ skipping 44 matching lines @@
   EXPECT_THAT(r.replacement(),
               IsFinishRegion(IsAllocate(IsNumberConstant(Context::SizeFor(
                                             Context::MIN_CONTEXT_SLOTS + 1)),
                                         IsBeginRegion(_), control),
                              _));
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8