Make circular type forwarder protection thread-safe #974
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PR #806 added protection against circular type forwarders using a
reentrancyGuard. However, the instance-levelboolfield created race conditions when multiple threads resolved the sameExportedType.This PR adds the
[ThreadStatic]attribute to thereentrancyGuardfield, ensuring that each thread maintains its own copy of the guard, eliminating race conditions.