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nir: a few 16-bit fixes

Erik Faye-Lund requested to merge kusma/mesa:nir-16-bit-fixes into master

Here's some patches factored out from !10101 (merged). I believe also !10185 (merged) would benefit from the first two patches.

The first two patches is about splitting nir_shader_compiler_options::support_8bit_alu into a separate flag for integer and floats.

The last patch fixes an issue I triggered when trying to run do yuv to rgb conversion on a texture lookup that was lowered to 16 bits.

/cc @pendingchaos for the first two patches.

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