Inconsistent test output in `aarch64` when using `-Zwrite-long-types-to-disk=yes`

[estebank]

Identified at https://github.com/rust-lang/rust/pull/144039/files#diff-50874c76f2d7b03cf2f8006f8e0d42851df89aec14ad3ee6000712c5f1650e97

When modifying tests/ui/confuse-field-and-method/issue-2392.rs to use -Zwrite-long-types-to-disk=yes, the output in aarch64 doesn't match the output in other platforms.

We should investigate why this is the case, as it indicates some issue with either the test runner or the type path shortening feature itself.