* config/bfin/bfin.c (struct loop_info): New members block_bitmap and
bad.
(struct loop_work and related VEC declarations): Delete.
(bfin_dump_loops): Print out new member bad.
(bfin_bb_in_loop): Use plain bitmap test. Don't recurse.
(bfin_scan_loop): Don't recurse.
(bfin_optimize_loop): Don't use a loop depth of -1 to indicate bad
loops. No longer need to update outer loops if the current one is
found bad. Move some validitiy checks to bfin_discover_loop.
(bfin_discover_loop): New function, mostly split from bfin_reorg_loops,
but changed not to check for nesting. Also changed to use the new bad
flag.
(bfin_reorg_loops): Use bfin_discover_loop to find single loops one at a
time. Use bitmap based test to discover loop nesting.
From-SVN: r116972
