pvr: Add new Rogue compiler framework

Merged Simon Perretta requested to merge simon-perretta-img/mesa:dev/new-compiler-framework into main

This MR adds the new Rogue shader compiler, which is fundamentally different from the existing framework. The previously hard-coded elements have been removed, exposing the entire USC pipeline and ISA features.

Additional changes have been made in order to address some shortcomings present in the first commit, and will be added to the MR pending review.

/cc @frankbinns @CreativeCylon @MTCoster

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