Fix reversed arguments in comparison to a smi constant.

src/codegen-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 1287 matching lines @@
       // where both sides are Smis.
       left_side.ToRegister();
       ASSERT(left_side.is_valid());
       JumpTarget is_smi(this);
       __ test(left_side.reg(), Immediate(kSmiTagMask));
       is_smi.Branch(zero, &left_side, &right_side, taken);
 
       // Setup and call the compare stub, which expects arguments in edx
       // and eax.
       CompareStub stub(cc, strict);
-      left_side.ToRegister(eax);
-      right_side.ToRegister(edx);
+      left_side.ToRegister(edx);  // Only left_side currently uses a register.
+      right_side.ToRegister(eax);  // left_side is not in eax.  eax is free.
       Result result = frame_->CallStub(&stub, &left_side, &right_side, 0);
       result.ToRegister();
       __ cmp(result.reg(), 0);
       result.Unuse();
       dest->true_target()->Branch(cc);
       dest->false_target()->Jump();
 
       is_smi.Bind(&left_side, &right_side);
       left_side.ToRegister();
       // Test smi equality and comparison by signed int comparison.
@@ skipping 5235 matching lines @@
 
   // Slow-case: Go through the JavaScript implementation.
   __ bind(&slow);
   __ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal