This moves initialization of heap limits to one place: ConfigureHeap
and also initializes the global limits there.

Change-Id: I7ca76073680a97627a8b1da9a8310af003794a93
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1648259Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62573}