[clang] [Clang] Fix a crash when checking the constraints of a self-referential concept (PR #208465)

[Corentin Jabot via cfe-commits]

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@@ -9303,6 +9306,7 @@ bool Sema::CheckConceptUseInDefinition(NamedDecl 
*Concept, SourceLocation Loc) {
       CE && !CE->isInvalidDecl() && !CE->hasDefinition()) {
     Diag(Loc, diag::err_recursive_concept) << CE;
     Diag(CE->getLocation(), diag::note_declared_at);
+    CE->setInvalidDecl();
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cor3ntin wrote:

This is what this is doing

https://github.com/llvm/llvm-project/pull/208465
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