Don't set mark array bits for UOH objects during concurrent marking #87533
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marking UOH objects was a historical thing from a policy we had a long time ago. and I had been meaning to get rid of it. a recent workitem we needed to do makes this actually a necessity.
I've done quite a bit testing on this - with stress framework (SVR and WKS) with lots of BGCs and UOH objects allocated during the current marking phase; with various outerloop tests (all passed except I gave up on libraries outerloop as it has so many failures normally. runtime outerloop tests all succeeded).