Update the compile-fail-fulldeps tests with new isize/usize literal suffixes.

src/test/compile-fail-fulldeps/issue-18986.rs

@@ -15,6 +15,6 @@ pub use use_from_trait_xc::Trait;
 
 fn main() {
     match () {
-        Trait { x: 42u } => () //~ ERROR use of trait `Trait` in a struct pattern
+        Trait { x: 42us } => () //~ ERROR use of trait `Trait` in a struct pattern
     }
 }