* flow.c (verify_flow_info): New function.

        (find_basic_blocks): Call it if ENABLE_CHECKING.
        (merge_blocks): Don't merge if there are non-deletable labels.
        * toplev.c (fatal_insn): Allow a printf-style arg list.
        * toplev.h (fatal_insn): Update prototype.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@26226 138bc75d-0d04-0410-961f-82ee72b054a4