Fix some tests that failed after we started linting on promoteds

Author: gurry

tests/ui/consts/const-eval/issue-50814.rs

@@ -14,6 +14,7 @@ struct Sum<A, B>(A, B);
 impl<A: Unsigned, B: Unsigned> Unsigned for Sum<A, B> {
     const MAX: u8 = A::MAX + B::MAX;
     //~^ ERROR evaluation of `<Sum<U8, U8> as Unsigned>::MAX` failed
+    //~| ERROR evaluation of `<Sum<U8, U8> as Unsigned>::MAX` failed
 }
 
 fn foo<T>(_: T) -> &'static u8 {

tests/ui/consts/const-eval/issue-50814.stderr

@@ -5,7 +5,7 @@ LL |     const MAX: u8 = A::MAX + B::MAX;
    |                     ^^^^^^^^^^^^^^^ attempt to compute `u8::MAX + u8::MAX`, which would overflow
 
 note: erroneous constant encountered
-  --> $DIR/issue-50814.rs:20:6
+  --> $DIR/issue-50814.rs:21:6
    |
 LL |     &Sum::<U8, U8>::MAX
    |      ^^^^^^^^^^^^^^^^^^
@@ -19,15 +19,15 @@ LL |     const MAX: u8 = A::MAX + B::MAX;
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 note: erroneous constant encountered
-  --> $DIR/issue-50814.rs:20:6
+  --> $DIR/issue-50814.rs:21:6
    |
 LL |     &Sum::<U8, U8>::MAX
    |      ^^^^^^^^^^^^^^^^^^
    |
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
 note: the above error was encountered while instantiating `fn foo::<i32>`
-  --> $DIR/issue-50814.rs:25:5
+  --> $DIR/issue-50814.rs:26:5
    |
 LL |     foo(0);
    |     ^^^^^^

tests/ui/consts/promotion.rs

@@ -25,9 +25,8 @@ fn main() {
     assert_static(&["d", "e", "f"]);
     assert_eq!(C, 42);
 
-    // make sure that these do not cause trouble despite overflowing
+    // make sure that this does not cause trouble despite overflowing
     assert_static(&(0-1));
-    assert_static(&-i32::MIN);
 
     // div-by-non-0 is okay
     assert_static(&(1/1));