Fix ldbl-128ibm acoshl inaccuracy (bug 16384)

[Andreas Jaeger]

On 01/01/2014 07:40 PM, Joseph S. Myers wrote:
> This patch fixes bug 16384, ldbl-128ibm acoshl inaccuracy, which
> showed up while attempting to regenerate ulps for powerpc-nofpu for
> 2.19.  There were two separate problems, use of __log1p instead of
> __log1pl and an insufficiently accurate constant value for log 2
> (which this patch replaces by use of M_LN2l), each of which could
> cause substantial inaccuracy in affected cases.
> 
> Tested for powerpc-nofpu.

Thanks,

Andreas
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