flow.c (find_basic_blocks): New argument `do_cleanup'.

        * flow.c (find_basic_blocks): New argument `do_cleanup'.
        Conditionally call delete_unreachable_blocks.
        (free_basic_block_vars): Zero ENTRY/EXIT data.
        (allocate_for_life_analysis): Kill.  Split into...
        (allocate_bb_life_data, allocate_reg_life_data): ... new functions.
        (life_analysis_1): Update.
        * gcse.c (gcse_main): Update find_basic_blocks call.
        * toplev.c (rest_of_compilation): Likewise.
        * stupid.c (stupid_life_analysis): Update life data calls.
        * rtl.h, output.h: Update prototypes.

From-SVN: r26090