[turbofan] Use CompareNilIC for abstract equality with null/undefined.

src/code-factory.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/bootstrapper.h"
 #include "src/ic/ic.h"
 
 namespace v8 {
@@ skipping 112 matching lines @@
 
 // static
 Callable CodeFactory::CompareIC(Isolate* isolate, Token::Value op,
                                 Strength strength) {
   Handle<Code> code = CompareIC::GetUninitialized(isolate, op, strength);
   return Callable(code, CompareDescriptor(isolate));
 }
 
 
 // static
+Callable CodeFactory::CompareNilIC(Isolate* isolate, NilValue nil_value) {
+  Handle<Code> code = CompareNilICStub::GetUninitialized(isolate, nil_value);
+  return Callable(code, CompareNilDescriptor(isolate));
+}
+
+
+// static
 Callable CodeFactory::BinaryOpIC(Isolate* isolate, Token::Value op,
                                  Strength strength) {
   BinaryOpICStub stub(isolate, op, strength);
   return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
 }
 
 
 // static
 Callable CodeFactory::InstanceOf(Isolate* isolate) {
   InstanceOfStub stub(isolate);
@@ skipping 156 matching lines @@
 Callable CodeFactory::InterpreterCEntry(Isolate* isolate) {
   // TODO(rmcilroy): Deal with runtime functions that return two values.
   // Note: If we ever use fpregs in the interpreter then we will need to
   // save fpregs too.
   CEntryStub stub(isolate, 1, kDontSaveFPRegs, kArgvInRegister);
   return Callable(stub.GetCode(), InterpreterCEntryDescriptor(isolate));
 }
 
 }  // namespace internal
 }  // namespace v8