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

Bug: v8:7161
Change-Id: Id110b4bd30fd8f67b9f8f23268e64de22e471c68
Reviewed-on: https://chromium-review.googlesource.com/c/1432596
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59073}