3e17635bca
Allow multiple threads to contribute to incremental marking. Also, avoid incremental markers handling large arrays that exceed their budget. TEST=ci Change-Id: Icefe490538ff486063a098077aaa962f0a3f2203 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/247260 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Siva Annamalai <asiva@google.com>