[v3] libstdc++/29722 part 3

[Benjamin Kosnik]

Phew. The actual fix. We have to define/use new exception classes that
are self-contained to this file to solve the undefined reference issues
in this PR. The error checking as currently written has already proved
to be useful in tracking down bugs, so I'm not too keen on removing or
simplifying it. Thus, the following, which keeps the same idea, just
differently expressed.

I'm inordinately proud of this testsuite entry, and consider it quite the
hack. I hope it works robustly. I guess this is a dividend for getting
"C" compilation figured out.

tested x86/linux
tested x86/linux -fno-exceptions

gcc
gcc-4_2-branch

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