[libstdc++ PATCH] Testsuite corrections

[Doug Gregor]

The attached patch corrects a number of libstdc++ testcases that invoke 
undefined behavior. The errors consist mainly of invalid operations on 
singular or past-the-end iterators. The patch subsumes the patch posted 
here:
   http://gcc.gnu.org/ml/libstdc++/2003-06/msg00096.html

Tested on powerpc-apple-darwin6.6; no regressions.

	Doug

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