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WIP: nir: mixed precision (16/32-bit) alu instructions

Jonathan Marek requested to merge flto/mesa:nir-alu-mixed into master

I am using this as part of implementing mediump for etnaviv (on top of the work by @zzoon and @nroberts).

  • etnaviv hardware allows mixing half precision and full precision without any limitations.
  • freedreno hardware can have different dest precision, but all sources must have the same precision.

For opt_constant_folding changes, would it be better to instead have nir_eval_const_opcode take the input sizes and do the conversions?

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