math: Add inputs that yield larger errors for float type

[Joseph Myers]

On Tue, 31 Mar 2020, Carlos O'Donell via Libc-alpha wrote:

> I'd like to see Joseph give this quick review also before committing.

This patch is OK.
> 
> You don't say why you limit j*/y* functions to ULP <=9, but I expect the

The libm-test machinery refuses to accept a larger ULP value in a 
libm-test-ulps file.  So any input that produces a larger ULP value 
results in a test FAIL.  And we have Bugzilla to track known issues rather 
than leaving FAILs in the testsuite.

-- 
Joseph S. Myers
joseph@codesourcery.com