http://codereview.chromium.org/18551/diff/1/2
File src/codegen-ia32.cc (right):

http://codereview.chromium.org/18551/diff/1/2#newcode1129
Line 1129: __ shl(ebx, shift_value);
It's late in the day so I could be wrong.

Do we really need to shift right kSmiTagSize, shift left shift_value,
and then shift left kSmiTagSize to reapply the tag?  Analogous to a
multiply, can't we just shift the tagged value if the tag is zero?

http://codereview.chromium.org/18551

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