Allow macro expansion for sampler registers with HLSL 4 and below
Allow macro expansion for sampler registers with HLSL 4 and below

LWJGL-CI/bgfx,LWJGL-CI/bgfx,mendsley/bgfx,bkaradzic/bgfx,jpcy/bgfx,jdryg/bgfx,jpcy/bgfx,emoon/bgfx,jdryg/bgfx,jpcy/bgfx,mendsley/bgfx,LWJGL-CI/bgfx,LWJGL-CI/bgfx,jdryg/bgfx,emoon/bgfx,emoon/bgfx,jdryg/bgfx,bkaradzic/bgfx,mendsley/bgfx,jpcy/bgfx,bkaradzic/bgfx,bkaradzic/bgfx