Cleaning Up More Mesa Shader Code

Ian Romanick of Intel, in the conquest to deliver OpenGL 3.0 support to the open-source Mesa stack by potentially year's end, has a new patch-set for examination.

This new patch-set isn't directly feature work, like the recent OpenGL Uniform Buffer Object support for Mesa, but is still worthwhile.

From the mailing list announcement, "This series is the first block of cleans and refactors from my idr-work branch (note: the tail of that branch is kind of a mess right now). This is working towards a fairly significant refactor of the way shaders (GLSL and assembly) are tracked and handled in Mesa. The end goal is to remove as much of the dependency on the particulars of the old Mesa IR as possible."