Attempt to fix observed AV in mark_through_cards_for_segments#60617

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PeterSolMS wants to merge 4 commits intodotnet:mainfrom

PeterSolMS:Fix_AV_in_mark_through_cards_for_segments

Commits on Oct 19, 2021

Attempt to fix observed AV in mark_through_cards_for_segments, add instrumentation to narrow down the issue.
PeterSolMS
committed

Commits on Oct 20, 2021

Address code review feedback:
PeterSolMS
committed

Commits on Oct 21, 2021

Save multiple copies of the pinned queue - before and after compact, and for multiple GCs.
PeterSolMS
committed

Commits on Oct 22, 2021

Disable regions for this experiment.
PeterSolMS
committed