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

[Marshall Clow]

(just to make sure that I understand), I see two changes here :

1. Some code movement (line 310-ish to line 116-ish). No real functionality change there.
2. Make the constructor for `__thread_specific_ptr` private, and add a friend decl for `__thread_local_data`.

Is that correct?


http://reviews.llvm.org/D8802

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