* flow.c (propagate_block): Move initialization of mem_set_list ...

        (init_propagate_block_info): ... here.  Also track blocks with
        no successors; don't scan insns if ! PROP_SCAN_DEAD_CODE.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@34310 138bc75d-0d04-0410-961f-82ee72b054a4