* haifa-sched.c (true_dependency_cache): New.

    * haifa-sched.c (true_dependency_cache): New.
        (add_dependence): Use the true dependency cache to avoid expensive
        walks down the LOG_LINKS dependency list.  Add entries to the
        cache as necessary.
        (remove_dependence): Remove entries from the true dependency cache
        as needed.
        (schedule_insns): Allocate and initialize and free the true
        dependency cache.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@30050 138bc75d-0d04-0410-961f-82ee72b054a4