R600: Various improvements

[Vincent Lejeune]

Hi,
Patches 2 and 3 factorizes some code from the backend. Patch 3 should avoid some recomputation too, which shouldn't hurt.
Patch 4 and 5 rework how textures are handled in our backend. It replaces TGSI like intrinsic (ie intrinsic that uses last argument as TextureTarget which has no sense
from hw pov) to intrinsic closer to hw. The pass could be done in mesa but I rather have it in llvm for now to ensure backward compatibility with llvm 3.3.

Vincent
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