GPU: Track buffer migrations and flush source on incomplete copy (#3952)

* Track buffer migrations and flush source on incomplete copy

Makes sure that the modified range list is always from the latest iteration of the buffer, and flushes earlier iterations of a buffer if the data has not been migrated yet.

* Cleanup 1

* Reduce cost for redundant signal checks on Vulkan

* Only inherit the range list if there are pending ranges.

* Fix OpenGL

* Address Feedback

* Whoops

Ryujinx.Graphics.Gpu/Memory/BufferCache.cs

@@ -273,7 +273,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
                         buffer.CopyTo(newBuffer, dstOffset);
                         newBuffer.InheritModifiedRanges(buffer);
 
-                        buffer.DisposeData();
+                        buffer.DecrementReferenceCount();
                     }
 
                     newBuffer.SynchronizeMemory(address, newSize);