Change FastArrayShift stub to use for-loop instead of memmove for SMIs.
The concurrent marker visits arrays with fast SMI elements because they have the same visitor id as arrays with tagged elements. Visiting concurrently with memmove can be unsafe depending on memmove implementation. Bug: chromium:694255 Change-Id: Ic6c2cae8761e5b1b042e4274d4f90ac59f32d91f Reviewed-on: https://chromium-review.googlesource.com/712158 Commit-Queue: Ulan Degenbaev <ulan@chromium.org> Reviewed-by: Tobias Tebbi <tebbi@chromium.org> Cr-Commit-Position: refs/heads/master@{#48454}
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