Refactored the code for comparing the type of an object with a constant....

src/virtual-frame-ia32.cc

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 378 matching lines @@
 void VirtualFrame::Enter() {
   // Registers live on entry: esp, ebp, esi, edi.
   Comment cmnt(masm_, "[ Enter JS frame");
 
 #ifdef DEBUG
   // Verify that edi contains a JS function.  The following code
   // relies on eax being available for use.
   __ test(edi, Immediate(kSmiTagMask));
   __ Check(not_zero,
            "VirtualFrame::Enter - edi is not a function (smi check).");
-  __ mov(eax, FieldOperand(edi, HeapObject::kMapOffset));
-  __ movzx_b(eax, FieldOperand(eax, Map::kInstanceTypeOffset));
-  __ cmp(eax, JS_FUNCTION_TYPE);
+  __ CmpObjectType(edi, JS_FUNCTION_TYPE, eax);
   __ Check(equal,
            "VirtualFrame::Enter - edi is not a function (map check).");
 #endif
 
   EmitPush(ebp);
 
   frame_pointer_ = stack_pointer_;
   __ mov(ebp, Operand(esp));
 
   // Store the context in the frame.  The context is kept in esi and a
@@ skipping 570 matching lines @@
   ASSERT(stack_pointer_ == elements_.length() - 1);
   elements_.Add(FrameElement::MemoryElement());
   stack_pointer_++;
   __ push(immediate);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal