Remove duplicate checks

Author: Thirumalai-Shaktivel

flang/lib/Semantics/check-omp-structure.cpp

@@ -2885,12 +2885,6 @@ void OmpStructureChecker::Leave(const parser::OmpClauseList &) {
   // clause
   CheckMultListItems();
 
-  // 2.7.3 Single Construct Restriction
-  if (GetContext().directive == llvm::omp::Directive::OMPD_end_single) {
-    CheckNotAllowedIfClause(
-        llvm::omp::Clause::OMPC_copyprivate, {llvm::omp::Clause::OMPC_nowait});
-  }
-
   auto testThreadprivateVarErr = [&](Symbol sym, parser::Name name,
                                      llvmOmpClause clauseTy) {
     if (sym.test(Symbol::Flag::OmpThreadprivate))

flang/test/Semantics/OpenMP/clause-validity01.f90

@@ -333,7 +333,6 @@
   !ERROR: NOWAIT clause must not be used with COPYPRIVATE clause on the SINGLE directive
   !$omp single private(a) lastprivate(c) nowait
   a = 3.14
-  !ERROR: Clause NOWAIT is not allowed if clause COPYPRIVATE appears on the END SINGLE directive
   !ERROR: COPYPRIVATE variable 'a' may not appear on a PRIVATE or FIRSTPRIVATE clause on a SINGLE construct
   !ERROR: At most one NOWAIT clause can appear on the SINGLE directive
   !ERROR: At most one NOWAIT clause can appear on the SINGLE directive
@@ -428,7 +427,7 @@
      enddo
   enddo
   !omp end do nowait
-  !$omp end parallel
+  !$omp end parallel 
 
 ! 2.11.4 parallel-do-simd-clause -> parallel-clause |
 !                                   do-simd-clause
@@ -586,7 +585,7 @@
      allc = 3.14
   enddo
 
-  !$omp target enter data map(alloc:A) device(0)
-  !$omp target exit data map(delete:A) device(0)
+  !$omp target enter data map(alloc:A) device(0) 
+  !$omp target exit data map(delete:A) device(0) 
 
 end program