[Interpreter] Only materialize output register if in a different equivalence set.
We only need to materialize the existing output register for a given register transfer if it is in a different equivalence set, otherwise we already have the value we want in the output register. BUG=v8:4280 Change-Id: Ic4966590ac10445180aff353940d2c93e6a818aa Reviewed-on: https://chromium-review.googlesource.com/493168Reviewed-by: Mythri Alle <mythria@chromium.org> Commit-Queue: Ross McIlroy <rmcilroy@chromium.org> Cr-Commit-Position: refs/heads/master@{#45051}
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