fortran: Add tests covering inline MINLOC/MAXLOC with DIM [PR90608]

fortran: Add tests covering inline MINLOC/MAXLOC with DIM [PR90608]

Add the tests covering the cases for which the following patches will
implement inline expansion of MINLOC and MAXLOC.  Those are cases where the
DIM argument is a constant value, and the ARRAY argument has rank greater
than 1.

	PR fortran/90608

gcc/testsuite/ChangeLog:

	* gfortran.dg/ieee/maxloc_nan_2.f90: New test.
	* gfortran.dg/ieee/minloc_nan_2.f90: New test.
	* gfortran.dg/maxloc_with_dim_1.f90: New test.
	* gfortran.dg/maxloc_with_dim_and_mask_1.f90: New test.
	* gfortran.dg/minloc_with_dim_1.f90: New test.
	* gfortran.dg/minloc_with_dim_and_mask_1.f90: New test.