Large number of C++ regressions in past couple of days

[David Ronis]

This may not be related, but optimized bootstrap builds generate hundreds of
g++ testsuite failures.  This has been the case as far back as 2.95.2 and in
the entire 2.96 snapshot series (have a look at any of my testsuite posts
on the testsuite list archive).  My guess that some of the IO library routines
are miscompiled and responsible responsible.

David Ronis