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nir/opt_varyings: Better handle potentially per-primitive FS inputs when linking MS and FS.

The following builtin fragment shader inputs:

  • Primitive ID
  • Layer
  • Viewport

are not defined by the spec as per-primitive inputs, but they are effectively per-primitive when the fragment shader is used together with a mesh shader. Improve nir_opt_varyings to handle that properly when linking MS and FS. Previously, this would only work in RADV thanks to manually hacking the primitive ID, layer and viewport to be per-primitive. I would like to remove that hack soon, hence this MR.

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