[Bug tree-optimization/68130] [6 Regression] gfortran.dg/ieee/ieee_2.f90 is miscomputed with '-Os -m32' on x86_64-apple-darwin14 after r228971

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68130

--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Created attachment 36602
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36602&action=edit
Reduced test

I have tried to reduce the test further, but when I comment a line the test
succeeds.