[stubs] replaced ToString MacroAssembler Stub with CodeStubAssembler builtin

src/code-stubs-hydrogen.cc

 // Copyright 2012 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-stubs.h"
 
 #include <memory>
 
 #include "src/bailout-reason.h"
+#include "src/code-factory.h"
 #include "src/crankshaft/hydrogen.h"
 #include "src/crankshaft/lithium.h"
 #include "src/field-index.h"
 #include "src/ic/ic.h"
 
 namespace v8 {
 namespace internal {
 
 
 static LChunk* OptimizeGraph(HGraph* graph) {
@@ skipping 1015 matching lines @@
         // The input is already a primitive.
         Push(input);
       }
       if_inputisprimitive.Else();
       {
         // Convert the input to a primitive.
         Push(BuildToPrimitive(input, input_map));
       }
       if_inputisprimitive.End();
       // Convert the primitive to a string value.
-      ToStringStub stub(isolate());
       HValue* values[] = {context(), Pop()};
-      Push(AddUncasted<HCallWithDescriptor>(Add<HConstant>(stub.GetCode()), 0,
-                                            stub.GetCallInterfaceDescriptor(),
+      Callable toString = CodeFactory::ToString(isolate());
+      Push(AddUncasted<HCallWithDescriptor>(Add<HConstant>(toString.code()), 0,
+                                            toString.descriptor(),
                                             ArrayVector(values)));
     }
     if_inputisstring.End();
   }
   if_inputissmi.End();
   return Pop();
 }
 
 
 HValue* CodeStubGraphBuilderBase::BuildToPrimitive(HValue* input,
@@ skipping 399 matching lines @@
   return Pop();
 }
 
 
 Handle<Code> KeyedLoadGenericStub::GenerateCode() {
   return DoGenerateCode(this);
 }
 
 }  // namespace internal
 }  // namespace v8