[PATCH] [libc++] Fix PR22606 - Leak pthread_key with static storage duration to ensure all of thread-local destructors are called.

[Eric Fiselier]

Since a rI'm sitting on this for a bit until I determine a couple of things.

1. Could libc++ use std::atexit to call the destructor function before destroying the pthread key?
2. What does the standard say about race conditions between thread-exit and program-exit? Do all created threads have to be terminated before std::exit() begins?
3. How do the pthread_key thread-exit destructors fit into the steps C++ takes at a thread exit?


http://reviews.llvm.org/D8802

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