LGTM, I'll land it for you...
https://codereview.chromium.org/53573004/diff/1/src/ia32/lithium-codegen-ia32.cc
File src/ia32/lithium-codegen-ia32.cc (right):
https://codereview.chromium.org/53573004/diff/1/src/ia32/lithium-codegen-ia32.cc#newcode2187
src/ia32/lithium-codegen-ia32.cc:2187: __ movaps(left_reg, right_reg);
If I see things correctly, this doesn't really solve the false
dependency problem in general: For even wider registers (Haswell etc.?)
we still have useless dependencies on the upper part. Perhaps this
should somehow be handled in a macro assembler instruction, but we have
to be careful about snapshots then.
Anyway, I don't think it hurts things, so this might be OK for now.
https://codereview.chromium.org/53573004/
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