fix ui tests

these ui changes are closer to what was there before const_trait_impl changes.

tests/ui/suggestions/invalid-bin-op.stderr

@@ -16,6 +16,10 @@ help: consider annotating `S<T>` with `#[derive(PartialEq)]`
 LL + #[derive(PartialEq)]
 LL | struct S<T>(T);
    |
+help: consider introducing a `where` clause, but there might be an alternative better way to express this requirement
+   |
+LL | pub fn foo<T>(s: S<T>, t: S<T>) where S<T>: PartialEq {
+   |                                 +++++++++++++++++++++
 
 error: aborting due to 1 previous error
 

tests/ui/ufcs/ufcs-qpath-self-mismatch.stderr

@@ -11,6 +11,19 @@ LL |     <i32 as Add<u32>>::add(1, 2);
              <&'a i32 as Add<i32>>
              <&i32 as Add<&i32>>
 
+error[E0277]: cannot add `u32` to `i32`
+  --> $DIR/ufcs-qpath-self-mismatch.rs:4:5
+   |
+LL |     <i32 as Add<u32>>::add(1, 2);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no implementation for `i32 + u32`
+   |
+   = help: the trait `Add<u32>` is not implemented for `i32`
+   = help: the following other types implement trait `Add<Rhs>`:
+             <i32 as Add>
+             <i32 as Add<&i32>>
+             <&'a i32 as Add<i32>>
+             <&i32 as Add<&i32>>
+
 error[E0308]: mismatched types
   --> $DIR/ufcs-qpath-self-mismatch.rs:7:28
    |
@@ -55,19 +68,6 @@ help: change the type of the numeric literal from `u32` to `i32`
 LL |     <i32 as Add<i32>>::add(1, 2i32);
    |                                ~~~
 
-error[E0277]: cannot add `u32` to `i32`
-  --> $DIR/ufcs-qpath-self-mismatch.rs:4:5
-   |
-LL |     <i32 as Add<u32>>::add(1, 2);
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no implementation for `i32 + u32`
-   |
-   = help: the trait `Add<u32>` is not implemented for `i32`
-   = help: the following other types implement trait `Add<Rhs>`:
-             <i32 as Add>
-             <i32 as Add<&i32>>
-             <&'a i32 as Add<i32>>
-             <&i32 as Add<&i32>>
-
 error: aborting due to 4 previous errors
 
 Some errors have detailed explanations: E0277, E0308.