Ensure fences are deleted in MappedStagingBuffer

If the staging buffer was deleted before the fences
were polled, they could be leaked. This may cause
resource exhaustion in some cases.

Author: jellysquid3

common/src/main/java/net/caffeinemc/mods/sodium/client/gl/arena/staging/MappedStagingBuffer.java

@@ -134,6 +134,13 @@ private static List<CopyCommand> consolidateCopies(PriorityQueue<CopyCommand> qu
 
     @Override
     public void delete(CommandList commandList) {
+        while (!this.fencedRegions.isEmpty()) {
+            var region = this.fencedRegions.dequeue();
+            var fence = region.fence();
+            fence.sync();
+            fence.delete();
+        }
+
         this.mappedBuffer.delete(commandList);
         this.fallbackStagingBuffer.delete(commandList);
         this.pendingCopies.clear();