This reloc mode is never encoded, so there is no reason to
differentiate between 32 and 64 bit.
Both are now replaced by RelocInfo::NONE.

R=mstarzinger@chromium.org

Change-Id: I054d99c7dc41f99729fa33617a6f47301b4a31e7
Reviewed-on: https://chromium-review.googlesource.com/878401Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50763}