[release/7.0] Fix issue #74741 - assert failure during weak pointer scanning. #74894
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Backport of #74810 to release/7.0
/cc @AntonLapounov @PeterSolMS
This fixes the assertion that I am regularly hitting in GC stress runs for crossgen2 (it is not specific to crossgen2 though). The fix is in debug-only code that validates the sync block record associated with an object and does not affect the release build. Makes it easier to run GC stress for crossgen2.