88ca1e95b8
This gives starting or finalizing concurrent marking a chance to run not-immediately-after-a-scavenge. TEST=ci Change-Id: Iec1ba7b7440045cc18e01637af1f865d588b24c2 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/246163 Reviewed-by: Siva Annamalai <asiva@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>