re PR libstdc++/54005 (Use __atomic_always_lock_free in libstdc++ is_lock_free instead of __atomic_is_lock_free)

2012-08-07  Benjamin Kosnik  <bkoz@redhat.com>

	PR libstdc++/54005
	* include/std/atomic: Use __atomic_always_lock_free.
	* include/bits/atomic_base.h: Same.

From-SVN: r190216