[DXGI] Better "performance" for FormatHelper.SizeOfInBits method. Fix size for all BC.* formats.
[DXGI] Better "performance" for FormatHelper.SizeOfInBits method. Fix size for all BC.* formats.

RobyDX/SharpDX,waltdestler/SharpDX,andrewst/SharpDX,shoelzer/SharpDX,dazerdude/SharpDX,davidlee80/SharpDX-1,weltkante/SharpDX,mrvux/SharpDX,VirusFree/SharpDX,TechPriest/SharpDX,fmarrabal/SharpDX,wyrover/SharpDX,PavelBrokhman/SharpDX,manu-silicon/SharpDX,sharpdx/SharpDX,manu-silicon/SharpDX,shoelzer/SharpDX,Ixonos-USA/SharpDX,dazerdude/SharpDX,shoelzer/SharpDX,mrvux/SharpDX,andrewst/SharpDX,PavelBrokhman/SharpDX,shoelzer/SharpDX,PavelBrokhman/SharpDX,davidlee80/SharpDX-1,jwollen/SharpDX,TigerKO/SharpDX,mrvux/SharpDX,VirusFree/SharpDX,VirusFree/SharpDX,andrewst/SharpDX,shoelzer/SharpDX,TigerKO/SharpDX,waltdestler/SharpDX,waltdestler/SharpDX,jwollen/SharpDX,fmarrabal/SharpDX,TigerKO/SharpDX,manu-silicon/SharpDX,weltkante/SharpDX,sharpdx/SharpDX,TechPriest/SharpDX,Ixonos-USA/SharpDX,TechPriest/SharpDX,davidlee80/SharpDX-1,dazerdude/SharpDX,RobyDX/SharpDX,sharpdx/SharpDX,wyrover/SharpDX,Ixonos-USA/SharpDX,fmarrabal/SharpDX,wyrover/SharpDX,RobyDX/SharpDX,fmarrabal/SharpDX,VirusFree/SharpDX,PavelBrokhman/SharpDX,wyrover/SharpDX,RobyDX/SharpDX,waltdestler/SharpDX,manu-silicon/SharpDX,weltkante/SharpDX,weltkante/SharpDX,TigerKO/SharpDX,TechPriest/SharpDX,Ixonos-USA/SharpDX,jwollen/SharpDX,dazerdude/SharpDX,davidlee80/SharpDX-1,jwollen/SharpDX