This is a reland of 036e5783.
Key JSBoundFunctionRef methods have been changed to return an optional
type, replacing the bogus always-true serialized() method.

Original change's description:
> [compiler] Make JSDataViewRef and JSBoundFunctionRef bg-serialized
>
> ... but keep/make subclass-specific methods do direct reads.
>
> Bug: v8:7790
> Change-Id: Ia4b9d207ce75cf28f6f0f33027ab05e27db49ce9
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2959621
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Georg Neis <neis@chromium.org>
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#75457}

Bug: v8:11960, v8:7790
Change-Id: I1f29283b2fb6e5fe3644e2f4e33341fce2641775
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3013313
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Santiago Aboy Solanes <solanes@chromium.org>
Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75628}