This is a reland of commit c8848cf4

This change was reverted due to a problem in a preceding change. This
relanded version differs in its implementations of the
CompilationCacheScript member functions Lookup, Put, and Age, because
the intent is to not change any behavior.

Original change's description:
> CompilationSubCache has some complexity regarding generations of tables
> which is only used by one subclass, CompilationCacheRegExp. This change
> adjusts the class hierarchy so that classes only contain the necessary
> member functions.
>
> Bug: v8:12808
> Change-Id: I4f4cf15bbf9b80c2de0c18aea82a0c238804759d
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3629603
> Reviewed-by: Leszek Swirski <leszeks@chromium.org>
> Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
> Cr-Commit-Position: refs/heads/main@{#80506}

Bug: v8:12808
Change-Id: Ib0621b7de8da86a89752c66907f6a56adff9075d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3665936Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#80825}