[Intel-gfx] Patch set to enable 2D composite on IGDNG

[Zhenyu Wang]

First one of this patch set trys to move current shader
programs into its own directory, which is a cleanup as
new IGDNG requires new compiled programs so I don't want
to put them under src/ any more.

Credit goes to Haihao who has figured out the vertex
element layout issue on IGDNG, and wrote the initial patch
for intel-gen4asm and DDX driver.

I'm sorry the first patch is quite long for maillist as
I've moved the shader programs.

thanks