llvm-project

27757fb8 - [Clang] Treat constexpr-unknown value as invalid in `EvaluateAsInitializer` (#128409)

[Clang] Treat constexpr-unknown value as invalid in `EvaluateAsInitializer` (#128409) It is an alternative to https://github.com/llvm/llvm-project/pull/127525. Close https://github.com/llvm/llvm-project/issues/127475.