Add more libm-test coverage of [a-c]* real functions

[Andreas Jaeger]

On 12/20/2013 07:50 PM, Joseph S. Myers wrote:
> Various libm functions have inadequate test coverage in libm-test.inc
> / auto-libm-test-in - failing to cover all the usual special cases
> (infinities, NaNs, zero, large and small finite values, subnormals) as
> well as a reasonable range of ordinary inputs and, where appropriate,
> inputs close to the thresholds for underflow and overflow.
> 
> This patch improves test coverage for real functions [a-c]* (with the
> expectation of adding more coverage for other functions later).
> 
> Tested x86_64 and x86 and ulps updated accordingly (and eight glibc
> bugs and one C11 DR filed for issues found in the process

Thanks!

Andreas
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