* flow.c (redirect_edge_and_branch_force): Initialize

        global_live_at_start and global_live_at_end.
        (allocate_bb_life_data): Export.
        * basic-block.h (allocate_bb_life_data): Declare it.
        * toplev.c (rest_of_compilation): Call it.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@44023 138bc75d-0d04-0410-961f-82ee72b054a4