[heap] Tie process-wide CodeRange lifetime to any remaining Heaps

Currently the process-wide CodeRange, once created, lives until process
shutdown. This CL changes it to be alive as long as there is a Heap,
when the last Heap is gone it gets destroyed and will be recreated the
next time a Heap is created. This behavior is shared with
SingleCopyReadOnlyArtifacts.

Bug: v8:11929
Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel_ng
Change-Id: I8a545926c3a4122991f9682bd3fd90e72697ea5a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2989103


Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Shu-yu Guo <syg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75522}