llvm-project

47c1aa4c - [X86] Add constexpr support for addsub intrinsics (#167512)

[X86] Add constexpr support for addsub intrinsics (#167512) Recent commits (7fe069121b57a, 53ddeb493529a) marked several x86 intrinsics as constexpr in headers without providing the necessary constant evaluation support in the compiler backend. This caused compilation failures when attempting to use these intrinsics in constant expressions. Resolves #166814 Resolves #161203