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AthenaServices: Avoid thread_local during fast stack dump.

Merged Scott Snyder requested to merge ssnyder/athena:tls.AthenaServices-20210615 into master

Accessing a thread_local variable may result in a call to malloc. Avoid using thread_local in code that runs as part of the fast stack dump, so that the dump will work even if the heap is corrupt.

See ATR-22583.

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