Re: update debug checks

[Paolo Carlini <paolo dot carlini at oracle dot com>]

... I went ahead and committed the below. Tested x86_64-linux, make
check, make check-debug.

For your future submissions, remember to diff from libstdc++-v3, not
testsuite or any other subdir. Also please *attach* the ChangeLog entry,
like the patch, this way it's easier to take it out from the message
while preserving the formatting.

Thanks again!
Paolo.

PS: if you look at SVN & Bugzilla, a long thorny story led to the
previous check_v3_target_debug_mode, stories having to do with weak
support on AIX. I think you did the right thing, and that these issues
do not affect anymore the currently supported AIX versions, but in
general we should be a tad more careful in such areas. Otherwise after a
couple of months we risk having to do with reported regressions on less
frequently tested arches...

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