Add test showing redundant barrier

Author: skatrak

flang/test/Lower/OpenMP/different_vars_lastprivate_barrier.f90

@@ -0,0 +1,40 @@
+! RUN: %flang_fc1 -fopenmp -mmlir --openmp-enable-delayed-privatization-staging=true -emit-hlfir %s -o - | FileCheck %s
+
+subroutine first_and_lastprivate
+  integer i
+  integer, dimension(3) :: var
+
+  !$omp parallel do lastprivate(i) private(var)
+  do i=1,1
+  end do
+  !$omp end parallel do
+end subroutine
+
+! CHECK:      omp.private {type = private} @[[VAR_PRIVATIZER:.*Evar_private_box_3xi32]] : [[BOX_TYPE:!fir\.box<!fir\.array<3xi32>>]] init {
+! CHECK-NEXT: ^bb0(%[[ORIG_REF:.*]]: {{.*}}, %[[PRIV_REF:.*]]: {{.*}}):
+! CHECK:        %[[ORIG_VAL:.*]] = fir.load %[[ORIG_REF]]
+! CHECK:        %[[BOX_DIMS:.*]]:3 = fir.box_dims %[[ORIG_VAL]], %{{.*}} : ([[BOX_TYPE]], index) -> (index, index, index)
+! CHECK:        %[[SHAPE_SHIFT:.*]] = fir.shape_shift %[[BOX_DIMS]]#0, %[[BOX_DIMS]]#1
+! CHECK:        %[[EMBOX:.*]] = fir.embox %{{.*}}(%[[SHAPE_SHIFT]]) : {{.*}} -> [[BOX_TYPE]]
+! CHECK:        fir.store %[[EMBOX]] to %[[PRIV_REF]]
+! CHECK:        omp.yield(%[[PRIV_REF]] : !fir.ref<[[BOX_TYPE]]>)
+! CHECK:      }
+
+! CHECK: omp.private {type = private} @[[I_PRIVATIZER:.*Ei_private_i32]] : i32
+
+! CHECK:  func.func @{{.*}}first_and_lastprivate()
+! CHECK:    %[[ORIG_I_DECL:.*]]:2 = hlfir.declare {{.*}} {uniq_name = "{{.*}}Ei"}
+! CHECK:    omp.parallel {
+! CHECK:      omp.barrier
+! CHECK:      omp.wsloop private(@[[I_PRIVATIZER]] %[[ORIG_I_DECL]]#0 -> %[[I_ARG:.*]], @[[VAR_PRIVATIZER]] {{.*}}) {
+! CHECK:        omp.loop_nest {{.*}} {
+! CHECK:          %[[PRIV_I_DECL:.*]]:2 = hlfir.declare %[[I_ARG]] {uniq_name = "{{.*}}Ei"}
+! CHECK:          fir.if %{{.*}} {
+! CHECK:            %[[PRIV_I_VAL:.*]] = fir.load %[[PRIV_I_DECL]]#0 : !fir.ref<i32>
+! CHECK:            hlfir.assign %[[PRIV_I_VAL]] to %[[ORIG_I_DECL]]#0
+! CHECK:          }
+! CHECK:          omp.yield
+! CHECK:        }
+! CHECK:      }
+! CHECK:      omp.terminator
+! CHECK:    }