LGTM

http://codereview.chromium.org/164056/diff/1/2
File src/x64/codegen-x64.cc (right):

http://codereview.chromium.org/164056/diff/1/2#newcode178
Line 178: static void LoadFloatOperand(MacroAssembler* masm, Register
scratch);
Add an empty line after declarations.

http://codereview.chromium.org/164056/diff/1/2#newcode214
Line 214: // Test if operands are smi or number objects (fp).
Requirements:
Unclear whether it tests (is smi or is heapnumber) or just whether it is
a heapnumber.

http://codereview.chromium.org/164056/diff/1/2#newcode3618
Line 3618: __ sahf();
Using sahf is theoretically unsafe (not supported on some early x64
chips).

http://codereview.chromium.org/164056

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