We currently store the {remaining_uncommitted_code_space_}. This CL
switches this to store {total_committed_code_space_} plus the maximum
allowed (in {max_committed_code_space_}). This counter will be used by
the GC to decide when to trigger a GC.

R=mstarzinger@chromium.org

Bug: v8:8217
Change-Id: I5946bbd3ba18e9fcbca4631afb942cd5b82834f5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1558084Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60702}