[flang][OpenMP] Verify support for private/firstprivate on unstructured sections

Verification of support for lowering private/firstprivate clauses
on unstructured sections.

Differential Revision: https://reviews.llvm.org/D145352

Reviewed By: TIFitis

Author: NimishMishra

flang/test/Lower/OpenMP/sections.f90

@@ -232,6 +232,8 @@ subroutine lastprivate()
 !CHECK: omp.terminator
 !CHECK: }
 !CHECK: omp.terminator
+!CHECK: }
+!CHECK: return
 !CHECK: }
 
     !$omp sections lastprivate(x)
@@ -240,3 +242,45 @@ subroutine lastprivate()
         30  x = x + 1
     !$omp end sections
 end subroutine
+
+subroutine unstructured_sections_privatization()
+!CHECK: %[[X:.*]] = fir.alloca f32 {bindc_name = "x", uniq_name = "_QFunstructured_sections_privatizationEx"}
+!CHECK: omp.sections {
+!CHECK: omp.section {
+!CHECK: %[[PRIVATE_X:.*]] = fir.alloca f32 {bindc_name = "x", pinned, uniq_name = "_QFunstructured_sections_privatizationEx"}
+!CHECK: cf.br ^bb1
+!CHECK: ^bb1:  // pred: ^bb0
+!CHECK: %[[INNER_PRIVATE_X:.*]] = fir.load %[[PRIVATE_X]] : !fir.ref<f32>
+!CHECK: %[[constant:.*]] = arith.constant 1.000000e+00 : f32
+!CHECK: %[[result:.*]] = arith.addf %[[INNER_PRIVATE_X]], %[[constant]] fastmath<contract> : f32
+!CHECK: fir.store %[[result]] to %[[PRIVATE_X]] : !fir.ref<f32>
+!CHECK: omp.terminator
+!CHECK: }
+!CHECK: omp.terminator
+!CHECK: }
+    !$omp sections private(x)
+        !$omp section
+            goto 40
+        40  x = x + 1
+    !$omp end sections
+!CHECK: omp.sections {
+!CHECK: omp.section {
+!CHECK: %[[PRIVATE_X:.*]] = fir.alloca f32 {bindc_name = "x", pinned, uniq_name = "_QFunstructured_sections_privatizationEx"}
+!CHECK: %[[temp:.*]] = fir.load %[[X]] : !fir.ref<f32>
+!CHECK: fir.store %[[temp]] to %[[PRIVATE_X]] : !fir.ref<f32>
+!CHECK: cf.br ^bb1
+!CHECK: ^bb1:  // pred: ^bb0
+!CHECK: %[[INNER_PRIVATE_X:.*]] = fir.load %[[PRIVATE_X]] : !fir.ref<f32>
+!CHECK: %[[constant:.*]] = arith.constant 1.000000e+00 : f32
+!CHECK: %[[result:.*]] = arith.addf %[[INNER_PRIVATE_X]], %[[constant]] fastmath<contract> : f32
+!CHECK: fir.store %[[result]] to %[[PRIVATE_X]] : !fir.ref<f32>
+!CHECK: omp.terminator
+!CHECK: }
+!CHECK: omp.terminator
+!CHECK: }
+    !$omp sections firstprivate(x)
+        !$omp section
+            goto 50
+        50  x = x + 1
+    !$omp end sections
+end subroutine