This is a reland of e3a42cfd

Original change's description:
> [cleanup] Remove Heap::kOldSpaceRoots constant
>
> ... in favour of RootsTable::IsImmortalImmovable().
>
> Bug: v8:8238
> Change-Id: Ic8434a1658b9ba982a93dd268dbfe52a6cc5c6a2
> Reviewed-on: https://chromium-review.googlesource.com/c/1270582
> Commit-Queue: Igor Sheludko <ishell@chromium.org>
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#56472}

TBR=ulan@chromium.org,yangguo@chromium.org

Bug: v8:8238
Change-Id: I20edf9c4a596670ad2e6cf1ee87e679ee4a66bee
Reviewed-on: https://chromium-review.googlesource.com/c/1270593Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56480}