This reverts commit dc9b48e4.

Reason for revert: https://crbug.com/1312188

Original change's description:
> Address comments from `[osr] Basic support for concurrent OSR`
>
> - Unhandlify OSROptimizedCodeCache::GetOptimizedCode.
> - Unstatic-fy FeedbackVector::SetOptimizedCode.
> - Remove frame-walking logic during the OSR tierup decision.
>
> Bug: v8:12161
> Change-Id: I4fa8c972cb50d369b17898ba57e1909c86e933df
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3560478
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Commit-Queue: Jakob Linke <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79686}

Bug: v8:12161, chromium:1312188
Change-Id: Ia64c4204f9f65f19aa858c61f32658cee310033e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3564990
Auto-Submit: Adam Klein <adamk@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#79701}