[release/8.0-staging] Remove invalid GCPROTECT for duplicate slot
#117030
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Backport of #100787 to release/8.0-staging
/cc @elinor-fung @AaronRobinsonMSFT @dotnet/interop-contrib
Customer Impact
This is an intermittent issue that can result in a crash when a GC occurs during marshalling of a struct. This was found via tests for 9.0 and reported by an external customer for 8.0.
Regression
dotnet/coreclr#26340
Testing
This issue was hit in GC stress tests. It was fixed in 9.0 and has been working since.
Risk
Low. Fix has been in since 9.0.