Speculative fix for System.OverflowException
Speculative fix for System.OverflowException

* Crash report came in with System.OverflowException inside FillPolygon,
  but I don't see a way for these values to get too large (or invalid
  some other way).

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