This CL
* migrates FeedbackVector::optimized_code to CodeT,
* migrates OSROptimizedCodeCache to CodeT.

Bug: v8:11880
Change-Id: I2082412fb9fdf90e7ed90f4454ecf55f4f3d53d8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3330468Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Nico Hartmann <nicohartmann@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78367}