Try to merge subresource states for resources that were split apart
Try to merge subresource states for resources that were split apart

* When a barrier applies to only one subresource out of an image, it's
  split into individual subresource tracking. There's nothing to merge
  it back together again, so it remains split even if the subresources
  go back to all being in the same state again. Simply checking when
  fetching the frame-initial states if we can merge can be a big win.

Anteru/renderdoc,Velro/renderdoc,michaelrgb/renderdoc,Yours3lf/renderdoc,Velro/renderdoc,googlestadia/renderdoc,baldurk/renderdoc,cgmb/renderdoc,Anteru/renderdoc,TurtleRockStudios/renderdoc_public,michaelrgb/renderdoc,victor-moya/renderdoc,etnlGD/renderdoc,victor-moya/renderdoc,cgmb/renderdoc,Velro/renderdoc,TurtleRockStudios/renderdoc_public,victor-moya/renderdoc,Anteru/renderdoc,Zorro666/renderdoc,etnlGD/renderdoc,Anteru/renderdoc,etnlGD/renderdoc,Lssikkes/renderdoc,TurtleRockStudios/renderdoc_public,etnlGD/renderdoc,Anteru/renderdoc,victor-moya/renderdoc,etnlGD/renderdoc,TurtleRockStudios/renderdoc_public,Zorro666/renderdoc,Anteru/renderdoc,cgmb/renderdoc,baldurk/renderdoc,Velro/renderdoc,Velro/renderdoc,TurtleRockStudios/renderdoc_public,victor-moya/renderdoc,Zorro666/renderdoc,Yours3lf/renderdoc,baldurk/renderdoc,googlestadia/renderdoc,Lssikkes/renderdoc,Anteru/renderdoc,baldurk/renderdoc,victor-moya/renderdoc,michaelrgb/renderdoc,Zorro666/renderdoc,Yours3lf/renderdoc,Lssikkes/renderdoc,googlestadia/renderdoc,Zorro666/renderdoc,Velro/renderdoc,michaelrgb/renderdoc,Lssikkes/renderdoc,googlestadia/renderdoc,cgmb/renderdoc,Yours3lf/renderdoc,googlestadia/renderdoc,Lssikkes/renderdoc,TurtleRockStudios/renderdoc_public,michaelrgb/renderdoc,baldurk/renderdoc,Yours3lf/renderdoc,baldurk/renderdoc,etnlGD/renderdoc,cgmb/renderdoc,googlestadia/renderdoc,Lssikkes/renderdoc,Yours3lf/renderdoc,Zorro666/renderdoc