Rollup merge of rust-lang#125527 - programmerjake:patch-2, r=workingjubilee

Add manual Sync impl for ReentrantLockGuard

Fixes: rust-lang#125526
Tracking Issue: rust-lang#121440

this impl is even shown in the summary in the tracking issue, but apparently was forgotten in the actual implementation

Author: matthiaskrgr

std/src/sync/reentrant_lock.rs

@@ -116,6 +116,9 @@ pub struct ReentrantLockGuard<'a, T: ?Sized + 'a> {
 #[unstable(feature = "reentrant_lock", issue = "121440")]
 impl<T: ?Sized> !Send for ReentrantLockGuard<'_, T> {}
 
+#[unstable(feature = "reentrant_lock", issue = "121440")]
+unsafe impl<T: ?Sized + Sync> Sync for ReentrantLockGuard<'_, T> {}
+
 #[unstable(feature = "reentrant_lock", issue = "121440")]
 impl<T> ReentrantLock<T> {
     /// Creates a new re-entrant lock in an unlocked state ready for use.