[release/8.0] Use reader/writer lock instead of mutex for ComWrappers RCW cache
#91149
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Backport of #91120 to release/8.0
/cc @AaronRobinsonMSFT
Customer Impact
User reported issue - #90964. This was observed in a C#/WinRT scenario and would help adoption for other WinRT users.
Testing
We have extensive testing for this scenario and for the performance issue, we've added dotnet/performance#3298.
See #91120 (comment) for details on lack of NAOT changes.
Risk
Low.
IMPORTANT: If this backport is for a servicing release, please verify that:
The PR target branch is
release/X.0-staging, notrelease/X.0.If the change touches code that ships in a NuGet package, you have added the necessary package authoring and gotten it explicitly reviewed.