[clang] [OpenMP][Clang] Enable inscan modifier for generic datatypes (PR #82220)

[Animesh Kumar via cfe-commits]

https://github.com/animeshk-amd updated https://github.com/llvm/llvm-project/pull/82220

>From 92ce8475d7c5b30d1c46f11cb85707b6e7d70f71 Mon Sep 17 00:00:00 2001
From: Animesh Kumar <animesh.kumar at amd.com>
Date: Mon, 19 Feb 2024 00:28:39 -0600
Subject: [PATCH] [OpenMP][Clang] Enable inscan modifier for generic datatypes

This patch fixes the #67002 ([OpenMP][Clang] Scan Directive not
supported for Generic types). It disables the Sema checks/analysis
that are run on the helper arrays which go into the implementation
of the `omp scan` directive until the template instantiation
happens.
---
 clang/lib/Sema/SemaOpenMP.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 7f75cfc5b54f35..f4364a259ad57f 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -4962,7 +4962,8 @@ StmtResult Sema::ActOnOpenMPRegionEnd(StmtResult S,
           if (RC->getModifier() != OMPC_REDUCTION_inscan)
             continue;
           for (Expr *E : RC->copy_array_temps())
-            MarkDeclarationsReferencedInExpr(E);
+            if (E)
+              MarkDeclarationsReferencedInExpr(E);
         }
         if (auto *AC = dyn_cast<OMPAlignedClause>(C)) {
           for (Expr *E : AC->varlists())