[clang] [clang][OpenMP] Diagnose badly-formed collapsed imperfect loop nests (#60678) (PR #101305)

[Alexey Bataev via cfe-commits]

================
@@ -7668,6 +7669,47 @@ struct LoopIterationSpace final {
   Expr *FinalCondition = nullptr;
 };
 
+class ForSubExprChecker : public RecursiveASTVisitor<ForSubExprChecker> {
+  const llvm::SmallSet<Decl *, 4> *CollapsedLoopVarDecls;
+  VarDecl *ForbiddenVar;
----------------
alexey-bataev wrote:

`VarDecl *ForbiddenVar = nullptr;`

https://github.com/llvm/llvm-project/pull/101305
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