Convert TEST_f_f tests from code to data

[Joseph S. Myers]

On Sun, 12 May 2013, Adhemerval Zanella wrote:

> I didn't dig into, but it shows on GCC 4.4.6, 4.7.4, and trunk (4.9). To 
> avoid more compiler ifdefs, I suggest just replace it to a constant. 
> Tested on PowerPC and PowerPC64.

I suggest defining a macro with this constant value along with the other 
M_* macros defined in libc-test.inc (whose definitions I made into decimal 
constants to avoid this sort of issue with GCC bug 26374: 
<http://sourceware.org/ml/libc-alpha/2013-05/msg00221.html>), rather than 
using the long constant directly as a test input.

-- 
Joseph S. Myers
joseph@codesourcery.com