[v3] libstdc++/23591

[Benjamin Kosnik]

Here is a fix for this problem, including the testsuite infrastructure to test for it.

This fix, although complete, led to the investigation of current
runtime issues surrounding cleanups of pending exceptions in
multi-threaded apps. Interestingly enough, the ARM eabi additions also
seem to have discovered this issue. 

Fixing this related issue is another bit of work, and is in progress.
I've been quite distracted while looking at this, and figure that
getting this hunk in is a good start. The additional fixups use this
work anyway.

tested x86/linux

-benjamin
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