[clang] [compiler-rt] [tsan] Add simulation to TSAN (PR #183200)

[Chris Cotter via cfe-commits]

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ccotter wrote:

I've updated the annotations to note simulation is not (currently) supported. Locking a pthread mutex in simulation mode needs direct access to the mutex to detect when the mutex is already held by someone else, and putting that thread to sleep in the SimScheduler, instead of blocking on the mutex (and thus deadlocking, since no other thread would be given a chance to run). 

https://github.com/llvm/llvm-project/pull/183200