added in https://github.com/llvm/llvm-project/commit/05137ecfca0bd2f7fa6cd30c771dfacbb8188785 / https://github.com/llvm/llvm-project/pull/65257 Is it because the JIT doesn't support de-duplication on Windows? @lhames