[flang][OpenMP] Add test: named COMMON + member with firstprivate+lastprivate is valid

Author: Krish Gupta

flang/test/Semantics/OpenMP/omp-common-fp-lp.f90

@@ -0,0 +1,13 @@
+! RUN: %flang_fc1 -fopenmp -fsyntax-only %s 2>&1 | FileCheck %s --allow-empty
+! CHECK-NOT: error:
+! CHECK-NOT: warning:
+
+subroutine sub1()
+  common /com/ j
+  j = 10
+!$omp parallel do firstprivate(j) lastprivate(/com/)
+  do i = 1, 10
+     j = j + 1
+  end do
+!$omp end parallel do
+end