This is in preparation of using some of these constants to compute
values for the Liftoff assembler that are themselves constexpr.

R=clemensh@chromium.org

Change-Id: I573ef4ca164e0107968e482996963fde9a3960b0
Reviewed-on: https://chromium-review.googlesource.com/1005056Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52527}