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Regression test for const promotion with Option<Ordering> https://rust.godbolt.org/z/EjxqE8WcT Fixes rust-lang/rust#139093 Add a regression test to ensure that comparing `Option<Ordering>` to `Some(Ordering::Equal)` does not trigger unnecessary const promotion in MIR. Previously, inlined constants like `Some(Ordering::Equal)` would get promoted, leading to more complex MIR and redundant LLVM IR checks. This test verifies that both the direct form and the `let`-binding form now generate equivalent, simplified MIR. r? cjgillot