r600g: remove TGSI->LLVM translation

It was useful for testing and as a prototype for radeonsi bringup,
but it's not used anymore and doesn't support OpenGL 3.3 even.

v2: try to fix OpenCL build

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Tested-by: Jan Vesely <jan.vesely@rutgers.edu>
10 files changed