fold_truthop patch causes sparcv9 testsuite regressions

[Roger Sayle]

> >  I know nothing of machine descriptions, and don't have access to a
> >  sparc machine, but hopefully I've tracked down the problem far enough
> >  that Dave can take it from here.
>
> Anyways, here is the patch.

Excellent.  Thanks very much.

Just out of curiosity, does this fix any other GCC test suite failures
using "-m64" on sparc*-sun-solaris*?  I'd have thought that the recent
20000511-1.c failure caused by my optimization is only the tip of the
iceberg.

Many thanks once again.

Roger
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