RFC: remove the "tile" architecture from glibc

[Joseph Myers]

On Thu, 1 Feb 2018, Adhemerval Zanella wrote:

> math/test-double-cosh
> math/test-double-exp
> math/test-double-exp10
> math/test-double-exp2
> - Return INF for non default rounding values

I should also note that it's probably possible to fix up the return values 
(by recomputing an overflowing expression in the original rounding mode) 
in the C error handling code in libm_error.c (only the _POSIX_ case is now 
reachable for newly linked programs).  That applies to all of float / 
double / long double.

-- 
Joseph S. Myers
joseph@codesourcery.com