[stubs] Drop CallApiCallbackStub::call_data_undefined optimization.

src/ia32/code-stubs-ia32.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.
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/code-stubs.h"
 #include "src/api-arguments.h"
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 2762 matching lines @@
 
   // context save.
   __ push(context);
 
   // callee
   __ push(callee);
 
   // call data
   __ push(call_data);
 
-  Register scratch = call_data;
-  if (!call_data_undefined()) {
-    // return value
-    __ push(Immediate(masm->isolate()->factory()->undefined_value()));
-    // return value default
-    __ push(Immediate(masm->isolate()->factory()->undefined_value()));
-  } else {
-    // return value
-    __ push(scratch);
-    // return value default
-    __ push(scratch);
-  }
+  // return value
+  __ push(Immediate(masm->isolate()->factory()->undefined_value()));
+  // return value default
+  __ push(Immediate(masm->isolate()->factory()->undefined_value()));
   // isolate
   __ push(Immediate(reinterpret_cast<int>(masm->isolate())));
   // holder
   __ push(holder);
 
+  Register scratch = call_data;
   __ mov(scratch, esp);
 
   // push return address
   __ push(return_address);
 
   if (!is_lazy()) {
     // load context from callee
     __ mov(context, FieldOperand(callee, JSFunction::kContextOffset));
   }
 
@@ skipping 116 matching lines @@
                            kStackUnwindSpace, nullptr, return_value_operand,
                            NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32