fortran: Add testcase [PR98203]

The reproducer from the bug report compiles cleanly on current
trunk.  Add a testcase to prevent future regressions.

	PR fortran/98203

gcc/testsuite/ChangeLog:

	PR fortran/98203
	* gfortran.dg/gomp/pr98203.f90: New test.

Signed-off-by: Christopher Albert <albert@tugraz.at>
(cherry picked from commit 37e5512)

Author: krystophny

gcc/testsuite/gfortran.dg/gomp/pr98203.f90

@@ -0,0 +1,14 @@
+! { dg-do compile }
+! PR fortran/98203
+! Contributed by G. Steinmetz <gscfq@t-online.de>
+!
+! ICE in gfc_trans_omp_do with collapse(2) and non-unit stride.
+
+subroutine s
+  integer :: i, j
+  !$omp parallel do collapse(2)
+  do i = 1, 10, 2
+    do j = 1, 10
+    end do
+  end do
+end