2009-06-27  Paolo Bonzini  <bonzini@gnu.org>

        * df-problems.c (df_set_seen, df_unset_seen): Delete.
        (df_rd_local_compute, df_md_local_compute): Inline them.

        (df_md_scratch): New.
        (df_md_alloc, df_md_free): Allocate/free it.
        (df_md_local_compute): Only include live registers in init.
        (df_md_transfer_function): Prune the in-set computed by
        the confluence function, and the gen-set too.

From-SVN: r149011