[stubs] Drop CallApiCallbackStub::call_data_undefined optimization.

src/ic/x64/handler-compiler-x64.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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/ic/handler-compiler.h"
 
 #include "src/api-arguments.h"
 #include "src/field-type.h"
@@ skipping 121 matching lines @@
         __ movp(holder, FieldOperand(holder, Map::kPrototypeOffset));
       }
       break;
     case CallOptimization::kHolderNotFound:
       UNREACHABLE();
       break;
   }
 
   Isolate* isolate = masm->isolate();
   Handle<CallHandlerInfo> api_call_info = optimization.api_call_info();
-  bool call_data_undefined = false;
   // Put call data in place.
   if (api_call_info->data()->IsUndefined(isolate)) {
-    call_data_undefined = true;
     __ LoadRoot(data, Heap::kUndefinedValueRootIndex);
   } else {
     if (optimization.is_constant_call()) {
       __ movp(data,
               FieldOperand(callee, JSFunction::kSharedFunctionInfoOffset));
       __ movp(data,
               FieldOperand(data, SharedFunctionInfo::kFunctionDataOffset));
       __ movp(data, FieldOperand(data, FunctionTemplateInfo::kCallCodeOffset));
     } else {
       __ movp(data,
               FieldOperand(callee, FunctionTemplateInfo::kCallCodeOffset));
     }
     __ movp(data, FieldOperand(data, CallHandlerInfo::kDataOffset));
   }
 
   // Put api_function_address in place.
   Address function_address = v8::ToCData<Address>(api_call_info->callback());
   __ Move(api_function_address, function_address,
           RelocInfo::EXTERNAL_REFERENCE);
 
   // Jump to stub.
-  CallApiCallbackStub stub(isolate, is_store, call_data_undefined,
-                           !optimization.is_constant_call());
+  CallApiCallbackStub stub(isolate, is_store, !optimization.is_constant_call());
   __ TailCallStub(&stub);
 }
 
 
 void PropertyHandlerCompiler::GenerateCheckPropertyCell(
     MacroAssembler* masm, Handle<JSGlobalObject> global, Handle<Name> name,
     Register scratch, Label* miss) {
   Handle<PropertyCell> cell = JSGlobalObject::EnsureEmptyPropertyCell(
       global, name, PropertyCellType::kInvalidated);
   Isolate* isolate = masm->isolate();
@@ skipping 241 matching lines @@
 Register NamedStoreHandlerCompiler::value() {
   return StoreDescriptor::ValueRegister();
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64