RFC: remove the "tile" architecture from glibc

[Joseph Myers]

On Wed, 7 Mar 2018, Adhemerval Zanella wrote:

> and sparcv9.  The powerpspe I thought we should be covered since we had
> powerpc hard float and soft float, but with recent build issues I think I
> will add it on the loop.

I expect some extra math/ test failures for powerpcspe as well.  There's a 
documented processor erratum for wrong signs of zero results for 
single-precision floating-point results (erratum CPU 4 at 
<https://www.nxp.com/docs/en/errata/MPC8548ECE.pdf>), which resulted in 
test failures the last time I tried, and an undocumented (as far as I 
know) issue with not implementing proper before-rounding tininess 
detection.

-- 
Joseph S. Myers
joseph@codesourcery.com