Add+Use mir::BinOp::Cmp

compiler/rustc_ty_utils/src/consts.rs

@@ -82,7 +82,7 @@ fn check_binop(op: mir::BinOp) -> bool {
     match op {
         Add | AddUnchecked | Sub | SubUnchecked | Mul | MulUnchecked | Div | Rem | BitXor
         | BitAnd | BitOr | Shl | ShlUnchecked | Shr | ShrUnchecked | Eq | Lt | Le | Ne | Ge
-        | Gt => true,
+        | Gt | Cmp => true,
         Offset => false,
     }
 }