[v3] libstdc++/33489

[Benjamin Kosnik]

> However, the referenced elements might not exist (a[0] == 0 or b[0]
> too large) in corner cases, even if all the sequences are non-empty.
> That's also the reason why the *set flags exist. We should use
> pointers instead. They could replace the *set flags as well (e. g.
> maxleft == NULL corresponds to maxleftset == false).

Done.

> Since we only refer to existing elements, we should be able to use
> pointers and/or references in all erroneous cases, in principle.

Got it. This patch does this, and removes all the 2.cc fails in the
testsuite in parallel mode.

tested x86/linux
tested x86/linux parallel

-benjamin
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