- Unhandlify OSROptimizedCodeCache::GetOptimizedCode.
- Unstatic-fy FeedbackVector::SetOptimizedCode.
- Remove frame-walking logic during the OSR tierup decision.

The reland is unchanged from the original CL.

Bug: v8:12161
Change-Id: Ibf03a9dd9a6fcd38c0664e5d5014a26d0240e035
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3568463Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79752}