[gfortran] Fix PR 19042

[Paul Brook]

> 2004-12-16  Tobias Schlueter  <tobias.schlueter@physik.uni-muenchen.de>
>
>  PR fortran/19032
>  * trans-intrinsic.c (gfc_conv_intrinsic_mod): Build FLOOR_MOD_EXPR
>  for MODULO of integers.  Move 'if (modulo)' conditional into switch.

Ok.
Do you also have a testcase?

Paul