Deal with spans showing std lib

Address rust-lang#53081

Author: estebank

src/test/ui/suggestions/imm-ref-trait-object.rs

@@ -1,3 +1,8 @@
+// FIXME: missing sysroot spans (#53081)
+// ignore-i586-unknown-linux-gnu
+// ignore-i586-unknown-linux-musl
+// ignore-i686-unknown-linux-musl
+
 fn test(t: &dyn Iterator<Item=&u64>) -> u64 {
      t.min().unwrap() //~ ERROR the `min` method cannot be invoked on a trait object
 }

src/test/ui/suggestions/imm-ref-trait-object.stderr

@@ -1,5 +1,5 @@
 error: the `min` method cannot be invoked on a trait object
-  --> $DIR/imm-ref-trait-object.rs:2:8
+  --> $DIR/imm-ref-trait-object.rs:7:8
    |
 LL |      t.min().unwrap()
    |        ^^^

src/test/ui/traits/trait-alias/trait-alias-object-fail.rs

@@ -1,3 +1,8 @@
+// FIXME: missing sysroot spans (#53081)
+// ignore-i586-unknown-linux-gnu
+// ignore-i586-unknown-linux-musl
+// ignore-i686-unknown-linux-musl
+
 #![feature(trait_alias)]
 
 trait EqAlias = Eq;

src/test/ui/traits/trait-alias/trait-alias-object-fail.stderr

@@ -1,5 +1,5 @@
 error[E0038]: the trait `std::cmp::Eq` cannot be made into an object
-  --> $DIR/trait-alias-object-fail.rs:7:13
+  --> $DIR/trait-alias-object-fail.rs:12:13
    |
 LL |     let _: &dyn EqAlias = &123;
    |             ^^^^^^^^^^^ the trait `std::cmp::Eq` cannot be made into an object
@@ -10,7 +10,7 @@ LL | pub trait Eq: PartialEq<Self> {
    |               --------------- the trait cannot be made into an object because it uses `Self` as a type parameter in this
 
 error[E0191]: the value of the associated type `Item` (from trait `std::iter::Iterator`) must be specified
-  --> $DIR/trait-alias-object-fail.rs:9:17
+  --> $DIR/trait-alias-object-fail.rs:14:17
    |
 LL |     let _: &dyn IteratorAlias = &vec![123].into_iter();
    |                 ^^^^^^^^^^^^^ help: specify the associated type: `IteratorAlias<Item = Type>`