59b8a9c4bb
This is reland of https://dart-review.googlesource.com/c/sdk/+/97340 rebased on top of removal of GraphMarked bit, which was not compatible with this ReadOnly->InVMIsolateHeap change(due to how write-pages are not covered by Contains check) Change-Id: I34c6421afb4baeafa5a449787020dab9fa800d05 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/97545 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Alexander Aprelev <aam@google.com>