b83b89a900
Closes https://github.com/dart-lang/sdk/issues/48591 TEST=vm/dart{,_2}/isolates/fast_object_copy_timeline_test Change-Id: I1de3a6f0d8a31450e45f689e0d67358285204a71 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/245167 Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>