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etnaviv: Switch to isaspec based encoder

Christian Gmeiner requested to merge austriancoder/mesa:isaspec-encode into main

What does this MR do and why?

Drop our custom (and too simple) assembler and switches to one that is powered by isaspec. This opens the door

  • to model special cases for instructions like a branch with no src's to a new jump instruction
  • to do the nir src -> instruction src mapping in isaspec
  • to support different instruction encodings (extended instructions and EVIS instructions)
  • to add meta information to instructions
  • to support special instructions that are used in compiler unit tests
  • ...

The list goes on and on 🙂

One important thing to note: this MR passes the manual etnaviv related CI steps.

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