Blocks should be synchronized on read-only fields (#5212)

* Blocks should be synchronized on read-only fields

* more readonlys

* fix alignment

* more

* Update ISelfController.cs

* simplify new

* simplify new

src/Ryujinx.Graphics.GAL/Multithreading/ThreadedRenderer.cs

@@ -56,7 +56,7 @@ namespace Ryujinx.Graphics.GAL.Multithreading
         private int _refConsumerPtr;
 
         private Action _interruptAction;
-        private object _interruptLock = new();
+        private readonly object _interruptLock = new();
 
         public event EventHandler<ScreenCaptureImageInfo> ScreenCaptured;