This reduces the arm32 binary by around 20kB.

R=jkummerow@chromium.org, mstarzinger@chromium.org

Bug: v8:6055
Change-Id: If9098e49793b29dceb8292aff6f668ca28a07728
Reviewed-on: https://chromium-review.googlesource.com/652427Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47863}