[vm/runtime] Create separate background compilation queues for optimized and unoptimized compilations. - create separate compilation queues for optimized and compilation queues - remove option FLAG_background_compilation_stop_alot doesn't seem to be used in any format testing - remove some class finalization checks before starting the background compiler Change-Id: I09feb500c2a5cc9c6e93347f63bfca41b83b35cf Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98301 Reviewed-by: Zach Anderson <zra@google.com> Commit-Queue: Siva Annamalai <asiva@google.com>
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