Add Atomics.notify instead of Atomics.wake according to revised spec.

- Keep .wake as an alias until we're certain it can be removed.
- Enable SAB memory

js/src/vm/Runtime.cpp

@@ -589,7 +589,7 @@ JSRuntime::requestInterrupt(InterruptMode mode)
         // Atomics.wait().
         fx.lock();
         if (fx.isWaiting())
-            fx.wake(FutexRuntime::WakeForJSInterrupt);
+            fx.notify(FutexRuntime::NotifyForJSInterrupt);
         fx.unlock();
         InterruptRunningJitCode(this);
     }