[clang] [clang] Bailout when the substitution of template parameter mapping is invalid. (PR #86869)

[Younan Zhang via cfe-commits]

https://github.com/zyn0217 approved this pull request.

Thanks! This reminds me that I should also check the validity of InstantiatingTemplate after introducing a new CodeSynthesisContext in my patch of fixing lambda calls within type alias decls.

https://github.com/llvm/llvm-project/pull/86869