DescriptionX64 tweaks.
Use movapd instead of movsd to move between xmm registers. Avoids partial
register writes and potential stalls.
Use xorps instead of xorpd to zero a register. Same effect and latency, but
one byte smaller.
Committed: http://code.google.com/p/v8/source/detail?r=7631
Patch Set 1 #Patch Set 2 : Added movaps and used it instead of movapd. #
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