[Flang][OpenMP] Reenable and fix final few tests 6/6 (#93295)

Add do02.f90 and taskloop03.f90 that were removed in
#92739
Replace shell script tests with python.

Author: kiranchandramohan

flang/test/Semantics/OpenMP/do02.f90

@@ -0,0 +1,21 @@
+! RUN: %python %S/../test_errors.py %s %flang_fc1 %openmp_flags
+! XFAIL: *
+
+! OpenMP Version 4.5
+! 2.7.1 Loop Construct
+! Exit statement terminating !$OMP DO loop
+
+program omp_do
+  integer i, j, k
+
+  !$omp do
+  do i = 1, 10
+    do j = 1, 10
+      print *, "Hello"
+    end do
+    !ERROR: EXIT statement terminating !$OMP DO loop
+    exit
+  end do
+  !$omp end do
+
+end program omp_do

flang/test/Semantics/OpenMP/sections03.f90

@@ -1,6 +1,4 @@
-! UNSUPPORTED: system-windows
-! Marking as unsupported due to suspected long runtime on Windows
-! RUN: %python %S/../test_errors.py %s %flang -fopenmp
+! RUN: %python %S/../test_errors.py %s %flang_fc1 %openmp_flags
 !XFAIL: *
 ! OpenMP version 5.0.0
 ! 2.8.1 sections construct

flang/test/Semantics/OpenMP/simd03.f90

@@ -1,6 +1,4 @@
-! UNSUPPORTED: system-windows
-! Marking as unsupported due to suspected long runtime on Windows
-! RUN: %S/test_errors.sh %s %t %flang -fopenmp
+! RUN: %python %S/../test_errors.py %s %flang_fc1 %openmp_flags
 ! XFAIL: *
 
 ! OpenMP Version 4.5

flang/test/Semantics/OpenMP/taskloop03.f90

@@ -0,0 +1,25 @@
+! RUN: %python %S/../test_errors.py %s %flang_fc1 %openmp_flags
+! XFAIL: *
+
+! OpenMP Version 4.5
+! 2.9.2 taskloop Construct
+! All loops associated with the taskloop construct must be perfectly nested,
+! there must be no intervening code or any OpenMP directive between
+! any two loops
+
+program omp_taskloop
+  integer i, j
+
+  !$omp taskloop private(j) grainsize(500) nogroup
+  do i=1, 10000
+    do j=1, i
+      call loop_body(i, j)
+    end do
+    !ERROR: Loops associated with !$omp taskloop is not perfectly nested
+    !$omp single
+    print *, "omp single"
+    !$omp end single
+  end do
+  !$omp end taskloop
+
+end program omp_taskloop