This is part of an effort to improve the performance of TA#subarray.

Bug: v8:7161
Change-Id: I6f4b0f01e498d48e0fce11fbf7dcd7a0ad1ae748
Reviewed-on: https://chromium-review.googlesource.com/c/1425002
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58988}