This patch cleans up remaining bits related to ENABLE_CHECKING. After applying
this patch (on top of part 9) we will no longer have any references to
ENABLE_CHECKING in the source code.

Bootstrapped and regtested (on top of part 9) on x86_64-pc-linux-gnu with
--enable-checking=yes and --enable-checking=release.

libcpp/ChangeLog:

2015-11-01  Mikhail Maltsev  <maltsevm@gmail.com>

        * config.in: Regenerate.
        * configure: Regenerate.
        * configure.ac: Remove ENABLE_CHECKING.

gcc/ChangeLog:

2015-11-01  Mikhail Maltsev  <maltsevm@gmail.com>

        * cfganal.c (inverted_post_order_compute): Remove conditional
        compilation, use flag_checking.
        * config.in: Regenerate.
        * configure: Regenerate.
        * configure.ac: Remove ENABLE_CHECKING.
        * genconditions.c: Do not #undef ENABLE_CHECKING.
        * sese.h (bb_in_region): Comment out broken check.
        * tree-ssa-loop-manip.c (rewrite_into_loop_closed_ssa_1): Remove
        conditional compilation, use flag_checking.

-- 
Regards,
    Mikhail Maltsev