Merge pull request rust-lang#20701 from A4-Tacks/track-caller-assist-test

Add `#[track_caller]` for check_assist_by_label

Author: ChayimFriedman2

src/tools/rust-analyzer/crates/ide-assists/src/tests.rs

@@ -180,6 +180,7 @@ pub(crate) fn check_assist_import_one(
 
 // There is no way to choose what assist within a group you want to test against,
 // so this is here to allow you choose.
+#[track_caller]
 pub(crate) fn check_assist_by_label(
     assist: Handler,
     #[rust_analyzer::rust_fixture] ra_fixture_before: &str,