[x64] Use smaller code sequence when pushing SMIs
If exactly one byte in the upper half of the pushed 8-byte value is set, use a smaller code sequence to push this value on the stack. Before, we did movq r10,<constant> push r10 Now, we do push 0x0 movb [rsp+<offset>],<byte> The old sequence had 12 bytes, the new one has 7. Pushing such values is used a lot for stack frame markers, which are small numbers (1-17) encoded as SMIs. Review-Url: https://codereview.chromium.org/2685213004 Cr-Commit-Position: refs/heads/master@{#43146}
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