D3D12: Fixed validation issues.
D3D12: Fixed validation issues.

LWJGL-CI/bgfx,emoon/bgfx,attilaz/bgfx,emoon/bgfx,fluffyfreak/bgfx,jpcy/bgfx,jpcy/bgfx,jdryg/bgfx,fluffyfreak/bgfx,LWJGL-CI/bgfx,MikePopoloski/bgfx,jdryg/bgfx,jpcy/bgfx,mendsley/bgfx,jpcy/bgfx,fluffyfreak/bgfx,fluffyfreak/bgfx,bkaradzic/bgfx,attilaz/bgfx,bkaradzic/bgfx,attilaz/bgfx,jdryg/bgfx,MikePopoloski/bgfx,jdryg/bgfx,MikePopoloski/bgfx,bkaradzic/bgfx,LWJGL-CI/bgfx,mendsley/bgfx,emoon/bgfx,bkaradzic/bgfx,LWJGL-CI/bgfx,mendsley/bgfx