[RuntimeAsync] A few asserts like "Assertion failed 'isSafeToContainMem'" in Libraries tests when runtime async is enabled

[VSadov]

Observed while enabling rt async in Libraires partition - #119432

Not a lot of info on this yet. I will keep assigned to me for now for more investigations.
Possibly codegen related, but may be not. Could be just a result of other mitigations/hacks.

Example:

Assertion failed 'isSafeToContainMem' in 'System.Threading.Tasks.Parallel+<>c__57`1[System.__Canon]:<ForEachAsync>b__57_0(System.Object):this' during 'Lowering nodeinfo' (IL size 224; hash 0x000e912a; Tier1)

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[jakobbotsch]

Fix is in #119806