[x64] Use xorl to materialize smi zero.
Before we always loaded smi zero via a movabs with a 64-bit immediate, which is pretty expensive compared to the xorl. R=jarin@chromium.org Committed: https://crrev.com/f236777bfe6e080ff1ead6baf847cc9b6bb4f9cb Cr-Commit-Position: refs/heads/master@{#27829} Review URL: https://codereview.chromium.org/1085153002 Cr-Commit-Position: refs/heads/master@{#32784}
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