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.Memory/Tracking/RegionHandle.cs

@@ -52,7 +52,7 @@ namespace Ryujinx.Memory.Tracking
 
         private event Action _onDirty;
 
-        private object _preActionLock = new object();
+        private readonly object _preActionLock = new();
         private RegionSignal _preAction; // Action to perform before a read or write. This will block the memory access.
         private PreciseRegionSignal _preciseAction; // Action to perform on a precise read or write.
         private readonly List<VirtualRegion> _regions;