Use 1 byte push REG instructions instead of the 2 byte ModRM version.

src/ic-ia32.cc

 // Copyright 2006-2008 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 520 matching lines @@
   // Get the receiver of the function from the stack; 1 ~ return address.
   __ mov(edx, Operand(esp, (argc + 1) * kPointerSize));
   // Get the name of the function to call from the stack.
   // 2 ~ receiver, return address.
   __ mov(ebx, Operand(esp, (argc + 2) * kPointerSize));
 
   // Enter an internal frame.
   __ EnterInternalFrame();
 
   // Push the receiver and the name of the function.
-  __ push(Operand(edx));
-  __ push(Operand(ebx));
+  __ push(edx);
+  __ push(ebx);
 
   // Call the entry.
   CEntryStub stub;
   __ mov(Operand(eax), Immediate(2));
   __ mov(Operand(ebx), Immediate(f));
   __ CallStub(&stub);
 
   // Move result to edi and exit the internal frame.
   __ mov(Operand(edi), eax);
   __ LeaveInternalFrame();
@@ skipping 254 matching lines @@
 
   // Do tail-call to runtime routine.
   __ TailCallRuntime(
       ExternalReference(IC_Utility(kSharedStoreIC_ExtendStorage)), 3);
 }
 
 #undef __
 
 
 } }  // namespace v8::internal