Rollup merge of #128343 - Dajamante:patch-4, r=pietroalbini

the output in `stderr` expects `panic-unwind`

r​? `@pietroalbini`

Author: matthiaskrgr

tests/ui/backtrace/synchronized-panic-handler.rs

@@ -3,6 +3,7 @@
 //@ edition:2021
 //@ exec-env:RUST_BACKTRACE=0
 //@ needs-threads
+//@ needs-unwind
 use std::thread;
 const PANIC_MESSAGE: &str = "oops oh no woe is me";