By changing AllocationFlag from enum to enum class

Bug: v8:12244, v8:12245
Change-Id: Ifdd04bb12026619f6422a98ee0890bd557f0e4e1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3181536
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Auto-Submit: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77188}