2012-06-20  David Edelsohn  <dje.gcc@gmail.com>
            Alan Modra  <amodra@gmail.com>

        * sysdep/powerpc/locks.h (compare_and_swap): Use GCC atomic
        intrinsics.
        (release_set): Same.
        (compare_and_swap_release): Same.
        (read_barrier): Same.
        (write_barrier): Same.

Co-Authored-By: Alan Modra <amodra@gmail.com>

From-SVN: r188829