[PATCH] Add atomic operations required by the new condition variable.

[Torvald Riegel]

This adds just a few atomic operations required by the new condvar.  Our
policy is to add atomic operations as needed, and this patch does just
that.

Tested on x86-linux and x86_64-linux using the new condvar.

2016-05-26  Torvald Riegel  <triegel@redhat.com>

	* include/atomic.h (atomic_exchange_relaxed, atomic_fetch_and_relaxed,
	atomic_fetch_and_release, atomic_fetch_or_release,
	atomic_fetch_xor_release): New.

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