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

[Julian Brown 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;
+  SourceRange ErrLoc;
+
+public:
+  explicit ForSubExprChecker(
+      const llvm::SmallSet<Decl *, 4> *CollapsedLoopVarDecls)
----------------
jtb20 wrote:

There isn't a SmallSetImpl, so I've changed all these to SmallPtrSet{,Impl} instead.

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