regression in Newlib 4.2.0

[Paul Zimmermann]

       Hi,

another regression in Newlib 4.2.0 (with 4.1.0 the largest error for tgammaf
was 239 ulps according to
https://members.loria.fr/PZimmermann/papers/accuracy.pdf):

Checking tgamma with newlib-4.2.0.20211231
MPFR library: 4.1.0       
MPFR header:  4.1.0 (based on 4.1.0)
Checking function tgammaf with MPFR_RNDN
libm wrong by up to 1.55e+26 ulp(s) [18446744073709551615] for x=-0x1.000002p-65
tgamma      gives -inf
mpfr_tgamma gives -0x1.fffffcp+64
Total: errors=2967689031 (69.37%) errors2=2773050476 maxerr=1.55e+26 ulp(s)

Paul