[PATCH][BZ 4997] Fix erroneous corner cases in PowerPC lround implementations

[Ryan S. Arnold]

Regarding Bugzilla 4997:

http://sourceware.org/bugzilla/show_bug.cgi?id=4997

The following patch fixes erroneous corner cases in the PowerPC
implementations of lround and llround for generic PowerPC, POWER4,
POWER5 and PowerPC 970.

The POWER5+ and POWER6[x] architectures are not affected by the bug due
to their use of the newly available 'frin' instruction).

I added a few new test cases to libm-test.inc and I've tested the patch
on POWER5, PowerPC 970, and POWER6 with success.

Ryan S. Arnold
IBM Linux Technology Center
Linux Toolchain Development
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