0713bce1fe
This was sometimes responsible for the largest GC pause in IsolateSendExitLatency, with a scavenge waiting for a concurrent marker to finish a whole array and pause. TEST=ci Change-Id: Ib2d8417ffe6cee3e8436a8c382d2db660e1eef41 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/371180 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>