The Assembler class (or some of them at least) have a CodeTargetAlign
method that aligns the code to a target specific value (16 byte on x86,
8 byte on arm). However, these were not used. Instead we always aligned
to 16 byte boundaries, hence wasting up to 8 bytes on arm.

Change-Id: Iee7d24ebc13a9a58002a9d7d0ce53955bee7d628
Reviewed-on: https://chromium-review.googlesource.com/c/1426125
Commit-Queue: Stephan Herhut <herhut@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59024}