This implements type conversion for the arm32 port of Liftoff.

Bug: v8:6600
Change-Id: Id100df92dc5e9f9df1b7b26158e35bb36b742f10
Reviewed-on: https://chromium-review.googlesource.com/c/1348409
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57778}