llvm-project

440fffad - [Clang][Concepts] Avoid substituting into constraints for invalid TemplateDecls (#75697)

[Clang][Concepts] Avoid substituting into constraints for invalid TemplateDecls (#75697) Fixes https://github.com/llvm/llvm-project/issues/73885. Substituting into constraints for invalid TemplateDecls might still yield dependent expressions and end up crashing later in evaluation.