[Bug libfortran/78314] [aarch64] ieee_support_halting does not report unsupported fpu traps correctly

[nsz at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78314

--- Comment #5 from nsz at gcc dot gnu.org ---
i plan to backport the fix, but it seems my fix is not correct and broke the
ieee_8.fp90 test.