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

Bug: v8:7161
Change-Id: Iffd469ca6528710c28cc454604a725ca9748359d
Reviewed-on: https://chromium-review.googlesource.com/c/1435768
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59105}