[mainline/4.0?] Fix 32-bit ieee tests on Linux/x86-64

[Eric Botcazou]

> Yes, it can.  But, testsuite improvements can also reveal subsequent
> compiler breakage.  And, make it easier for people to see breakage by
> reducing noise.  And, make users feel better by seeing fewer spurious
> failures.  So, in my opinion, the risks are worthwhile.

I respectfully dissent here: the only way to guarantee a regression-free 
compiler is to change the set of regression tests only monotically, i.e. 
basically to only add new tests.

-- 
Eric Botcazou