http://codereview.chromium.org/160452/diff/1/4
File src/x64/ic-x64.cc (right):

http://codereview.chromium.org/160452/diff/1/4#newcode429
Line 429: __ movl(rbx, rbx);  // Clear the high bits of rbx.
Ah, special case: The default size of xchg is 64-bit, you need  a
two-byte sequence to make it 32-bit.

http://codereview.chromium.org/160452

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