[Bug fortran/88678] [9 regression] Many gfortran.dg/ieee/ieee_X.f90 test cases fail starting with r267465

[nsz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88678

--- Comment #21 from nsz at gcc dot gnu.org ---
this fix undid the change for bug 78314
do you plan to backport it to gcc 7,8 branches ?

note that in principle on targets where trapping is not supported
the "immediate alternate exception handling" mechanism of ieee 754
can be emulated by save/clear/check/restore status flags around each
fp operation, but i don't think gcc currently supports that
(and it's not very practical unless somebody uses it for debugging
fp issues).