* alias.h (ALIAS_SET_MEMORY_BARRIER): New.

        * alias.c (true_dependence): Respect it.
        (canon_true_dependence, write_dependence_p): Likewise.
        * builtins.c (get_builtin_sync_mem): Set it.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@110189 138bc75d-0d04-0410-961f-82ee72b054a4