[6.0][region-isolation] Dont crash when processing global actor isolated init accessors. #74326
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Explanation: This PR makes sure that we do not crash when we process global actor isolated init accessors. The crash is a result of memory corruption due to misinterpreting a union + enum (a c++ version of an enum + associated values).
Original PRs:
Risk: Low. This only impacts global actor isolated init accessors that we would crash on without this anyways.
Testing: Added tests to the test suite.
Reviewer: N/A