[Bug fortran/56226] Add support for DEC UNION and MAP extensions

[fritzoreese at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56226

--- Comment #29 from Fritz Reese <fritzoreese at gmail dot com> ---
(In reply to Andreas Schwab from comment #25)
> FAIL: gfortran.dg/dec_union_4.f90   -O0  execution test
> FAIL: gfortran.dg/dec_union_4.f90   -O1  execution test
> FAIL: gfortran.dg/dec_union_4.f90   -O2  execution test
> FAIL: gfortran.dg/dec_union_4.f90   -O3 -fomit-frame-pointer -funroll-loops
> -fpeel-loops -ftracer -finline-functions  execution test
> FAIL: gfortran.dg/dec_union_4.f90   -O3 -g  execution test
> FAIL: gfortran.dg/dec_union_4.f90   -Os  execution test

It was silly of me to disregard endian-ness in this test case. Fixed:

https://gcc.gnu.org/ml/fortran/2016-05/msg00018.html