re PR c++/55135 (Segfault of gcc on a big file)
gcc/
PR c++/55135
* except.h (remove_unreachable_eh_regions): New prototype.
* except.c (remove_eh_handler_splicer): New function, split out
of remove_eh_handler.
(remove_eh_handler): Use remove_eh_handler_splicer. Add comment
warning about running it on many EH regions one at a time.
(remove_unreachable_eh_regions_worker): New function, walk the
EH tree in depth-first order and remove non-marked regions.
(remove_unreachable_eh_regions): New function.
* tree-eh.c (mark_reachable_handlers): New function, split out
from remove_unreachable_handlers.
(remove_unreachable_handlers): Use mark_reachable_handlers and
remove_unreachable_eh_regions.
(remove_unreachable_handlers_no_lp): Use mark_reachable_handlers
and remove_unreachable_eh_regions.
From-SVN: r196464