Auto merge of #33861 - Amanieu:lock_elision_fix, r=alexcrichton

Make sure Mutex and RwLock can't be re-locked on the same thread

Fixes #33770

r? @alexcrichton

src/libstd/sync/mutex.rs

@@ -204,10 +204,14 @@ impl<T> Mutex<T> {
     /// Creates a new mutex in an unlocked state ready for use.
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn new(t: T) -> Mutex<T> {
-        Mutex {
+        let mut m = Mutex {
             inner: box StaticMutex::new(),
             data: UnsafeCell::new(t),
+        };
+        unsafe {
+            m.inner.lock.init();
         }
+        m
     }
 }