GPU: Fix errors handling texture remapping (#4745)

* GPU: Fix errors handling texture remapping

- Fixes an error where a pool entry and memory mapping changing at the same time could cause a texture to rebind its data from the wrong GPU VA (data swaps)
- Fixes an error where the texture pool could act on a mapping change before the mapping has actually been changed ("Unmapped" event happens before change, we need to signal it changed _after_ it completes)

TODO: remove textures from partially mapped list... if they aren't.

* Add Remap actions for handling post-mapping behaviours

* Remove unused code.

* Address feedback

* Nit

src/Ryujinx.Graphics.Gpu/Image/TexturePool.cs

@@ -272,7 +272,15 @@ namespace Ryujinx.Graphics.Gpu.Image
 
                     ulong address = descriptor.UnpackAddress();
 
-                    MultiRange range = _channel.MemoryManager.GetPhysicalRegions(address, texture.Size);
+                    if (!descriptor.Equals(ref DescriptorCache[request.ID]))
+                    {
+                        // If the pool entry has already been replaced, just remove the texture.
+
+                        texture.DecrementReferenceCount();
+                        continue;
+                    }
+
+                    MultiRange range = _channel.MemoryManager.Physical.TextureCache.UpdatePartiallyMapped(_channel.MemoryManager, address, texture);
 
                     // If the texture is not mapped at all, delete its reference.