[PATCH] [libcxx] LWG2442: call_once() shouldn't DECAY_COPY()

[Agustín Bergé]

Hi mclow.lists, EricWF,

Implement LWG2442, use references to `call_once` arguments instead of decay-copying them.

http://reviews.llvm.org/D10191

Files:
  include/mutex
  test/std/thread/thread.mutex/thread.once/thread.once.callonce/call_once.pass.cpp
  www/cxx1z_status.html

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