* include/private/gc_locks.h [IA64]: Include ia64intrin.h.

        (GC_test_and_set): Use __sync_lock_test_and_set.
        (GC_clear): Use volatile assignment.
        (GC_compare_and_exchange): Use __sync_bool_compare_and_swap.
        (GC_memory_write_barrier): Use __sync_synchronize.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@64736 138bc75d-0d04-0410-961f-82ee72b054a4