[clang] [clang] Fix static analyzer concerns (PR #110243)

[Mariya Podchishchaeva via cfe-commits]

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@@ -9195,7 +9195,7 @@ static bool checkOpenMPIterationSpace(
         SemaRef.Diag(CollapseLoopCountExpr->getExprLoc(),
                      diag::note_omp_collapse_ordered_expr)
             << 0 << CollapseLoopCountExpr->getSourceRange();
-      else
+      else if (OrderedLoopCountExpr)
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Fznamznon wrote:

The problem with this approach is that both `OrderedLoopCountExpr` and `CollapseLoopCountExpr` will be dereferenced on lines 9192 and 9193 if they're both are `nullptr`s.

https://github.com/llvm/llvm-project/pull/110243