This removes the redundant {Safepoint::kNoDeoptimizationIndex}
definition, and uses {SafepointEntry::kNoDeoptIndex} consistently.

R=jkummerow@chromium.org

Bug: v8:12401
Change-Id: I4e12862d96a2b97245f8dde62243013425e53ff1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3289159Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77979}