tests: remove ignore directives from tests that mention core/alloc/std spans.

src/test/ui/error-codes/E0004-2.rs

@@ -1,8 +1,3 @@
-// FIXME: missing sysroot spans (#53081)
-// ignore-i586-unknown-linux-gnu
-// ignore-i586-unknown-linux-musl
-// ignore-i686-unknown-linux-musl
-
 fn main() {
     let x = Some(1);
 

src/test/ui/error-codes/E0004-2.stderr

@@ -1,5 +1,5 @@
 error[E0004]: non-exhaustive patterns: `None` and `Some(_)` not covered
-  --> $DIR/E0004-2.rs:9:11
+  --> $DIR/E0004-2.rs:4:11
    |
 LL |     match x { }
    |           ^ patterns `None` and `Some(_)` not covered

src/test/ui/error-codes/E0005.rs

@@ -1,8 +1,3 @@
-// FIXME: missing sysroot spans (#53081)
-// ignore-i586-unknown-linux-gnu
-// ignore-i586-unknown-linux-musl
-// ignore-i686-unknown-linux-musl
-
 fn main() {
     let x = Some(1);
     let Some(y) = x; //~ ERROR E0005

src/test/ui/error-codes/E0005.stderr

@@ -1,5 +1,5 @@
 error[E0005]: refutable pattern in local binding: `None` not covered
-  --> $DIR/E0005.rs:8:9
+  --> $DIR/E0005.rs:3:9
    |
 LL |     let Some(y) = x;
    |         ^^^^^^^ pattern `None` not covered

src/test/ui/error-codes/E0297.rs

@@ -1,8 +1,3 @@
-// FIXME: missing sysroot spans (#53081)
-// ignore-i586-unknown-linux-gnu
-// ignore-i586-unknown-linux-musl
-// ignore-i686-unknown-linux-musl
-
 fn main() {
     let xs : Vec<Option<i32>> = vec![Some(1), None];
 

src/test/ui/error-codes/E0297.stderr

@@ -1,5 +1,5 @@
 error[E0005]: refutable pattern in `for` loop binding: `None` not covered
-  --> $DIR/E0297.rs:9:9
+  --> $DIR/E0297.rs:4:9
    |
 LL |     for Some(x) in xs {}
    |         ^^^^^^^ pattern `None` not covered