[stubs] Drop CallApiCallbackStub::call_data_undefined optimization.

src/ic/x64/handler-compiler-x64.cc

Index: src/ic/x64/handler-compiler-x64.cc
diff --git a/src/ic/x64/handler-compiler-x64.cc b/src/ic/x64/handler-compiler-x64.cc
index cd831c8b5fd85623c1cc5982332c7067aaf100c4..eeddd55a7b32cf67575ae7351532b87d51d83a34 100644
--- a/src/ic/x64/handler-compiler-x64.cc
+++ b/src/ic/x64/handler-compiler-x64.cc
@@ -139,10 +139,8 @@ void PropertyHandlerCompiler::GenerateApiAccessorCall(
 
   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()) {
@@ -164,8 +162,7 @@ void PropertyHandlerCompiler::GenerateApiAccessorCall(
           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);
 }