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

[Eric Fiselier]

LGTM and thanks! I'm going to cleanup the original `call_once` tests and add new tests once this is committed.

@mclow.lists We want to adopt this change retroactively, correct?
@K-ballo Do you want me to commit this for you?


http://reviews.llvm.org/D10191

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