[PATCH] Implement shared_mutex re: N4508

[Marshall Clow]

Hi EricWF,

[N45088](http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4508) adds `shared_mutex` to the set of mutex classes.  This is exactly the same as `shared_timed_mutex`, without the timed bits.

Create a new class `__shared_mutex_base` with all the non-timed bits in it, and make `shared_timed_mutex` and `shared_mutex` use it. Don't inherit from it, because ABI break. Also, leave some stubs in the dylib for the functions that were renamed, because ABI break.

Duplicate the `shared_timed_mutex` tests, strip out the timed bits, and rename them to use `shared_mutex`

http://reviews.llvm.org/D10480

Files:
  include/shared_mutex
  src/shared_mutex.cpp
  test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/nothing_to_do.pass.cpp
  test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/assign.fail.cpp
  test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/copy.fail.cpp
  test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/default.pass.cpp
  test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp
  test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp
  test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock.pass.cpp
  test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/try_lock_shared.pass.cpp

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