Merge #7574

7574: Remove various redundant clones r=kjeremy a=yoshuawuyts

I noticed when running clippy through RA that there are a few instances where `clone` is called where it's not actually needed. I figured a small patch to remove these might be welcome here.

Thanks!

Co-authored-by: Yoshua Wuyts <yoshuawuyts@gmail.com>

crates/hir_ty/src/diagnostics.rs

@@ -511,7 +511,7 @@ mod tests {
             // FIXME: macros...
             let file_id = src.file_id.original_file(&db);
             let range = src.value.to_node(&root).text_range();
-            let message = d.message().to_owned();
+            let message = d.message();
             actual.entry(file_id).or_default().push((range, message));
         });