[flang][OpenMP] Add symbol table scopes for teams and parallel

Adds symbol map scopes for standalone `teams` and `parallel` constructs.
This is required to properly bind the privatized symbols in both
constructs so that nested constructs can find them.

Resolves #116428.

Author: ergawy

flang/lib/Lower/OpenMP/OpenMP.cpp

@@ -2674,6 +2674,7 @@ genTeamsOp(lower::AbstractConverter &converter, lower::SymMap &symTable,
            semantics::SemanticsContext &semaCtx, lower::pft::Evaluation &eval,
            mlir::Location loc, const ConstructQueue &queue,
            ConstructQueue::const_iterator item) {
+  lower::SymMapScope scope(symTable);
   mlir::omp::TeamsOperands clauseOps;
   llvm::SmallVector<const semantics::Symbol *> reductionSyms;
   genTeamsClauses(converter, semaCtx, stmtCtx, item->clauses, loc, clauseOps,
@@ -2981,6 +2982,7 @@ static mlir::omp::ParallelOp genStandaloneParallel(
     lower::StatementContext &stmtCtx, semantics::SemanticsContext &semaCtx,
     lower::pft::Evaluation &eval, mlir::Location loc,
     const ConstructQueue &queue, ConstructQueue::const_iterator item) {
+  lower::SymMapScope scope(symTable);
   mlir::omp::ParallelOperands parallelClauseOps;
   llvm::SmallVector<const semantics::Symbol *> parallelReductionSyms;
   genParallelClauses(converter, semaCtx, stmtCtx, item->clauses, loc,
@@ -4027,13 +4029,6 @@ static void genOMP(lower::AbstractConverter &converter, lower::SymMap &symTable,
           parser::ToUpperCaseLetters(llvm::omp::getOpenMPClauseName(clause.id));
       TODO(clauseLocation, name + " clause is not implemented yet");
     }
-
-    if (std::holds_alternative<clause::Private>(clause.u) &&
-        origDirective == llvm::omp::Directive::OMPD_target_teams)
-      TODO(clauseLocation, "TARGET TEAMS PRIVATE is not implemented yet");
-    if (std::holds_alternative<clause::Private>(clause.u) &&
-        origDirective == llvm::omp::Directive::OMPD_target_parallel)
-      TODO(clauseLocation, "TARGET PARALLEL PRIVATE is not implemented yet");
   }
 
   llvm::omp::Directive directive =

flang/test/Lower/OpenMP/Todo/target-parallel-private.f90

@@ -0,0 +1,21 @@
+! RUN: %flang_fc1 -emit-hlfir -fopenmp -mmlir --enable-delayed-privatization \
+! RUN:   -o - %s 2>&1 | FileCheck %s
+! RUN: bbc -emit-hlfir -fopenmp --enable-delayed-privatization -o - %s 2>&1 |\
+! RUN:   FileCheck %s
+
+!===============================================================================
+! `private` clause on `target parallel`
+!===============================================================================
+
+subroutine target_parallel_private()
+integer, dimension(3) :: i
+!$omp target parallel private(i)
+!$omp end target parallel
+end subroutine
+
+! CHECK: omp.private {type = private} @[[PRIVATIZER:.*]] : {{.*}}
+
+! CHECK: omp.target {{.*}} {
+! CHECK:   omp.parallel private(@[[PRIVATIZER]] %{{.*}} -> %{{.*}} : {{.*}}) {
+! CHECK:   }
+! CHECK: }

flang/test/Lower/OpenMP/Todo/target-teams-private.f90

@@ -0,0 +1,20 @@
+! RUN: %flang_fc1 -emit-hlfir -fopenmp -mmlir --enable-delayed-privatization \
+! RUN:   -o - %s 2>&1 | FileCheck %s
+! RUN: bbc -emit-hlfir -fopenmp --enable-delayed-privatization -o - %s 2>&1 |\
+! RUN:   FileCheck %s
+
+!===============================================================================
+! `private` clause on `target teams`
+!===============================================================================
+
+subroutine target_teams_private()
+integer, dimension(3) :: i
+!$omp target teams private(i)
+!$omp end target teams
+end subroutine
+
+! CHECK: omp.target {{.*}} {
+! CHECK:   omp.teams {
+! CHECK:     %{{.*}} = fir.alloca !fir.array<3xi32> {bindc_name = "i", {{.*}}}
+! CHECK:   }
+! CHECK: }