check_consts: make ops module private

Author: RalfJung

src/librustc_mir/transform/check_consts/mod.rs

@@ -13,7 +13,7 @@ use std::fmt;
 
 pub use self::qualifs::Qualif;
 
-pub mod ops;
+mod ops;
 pub mod qualifs;
 mod resolver;
 pub mod validation;