i965: Split nir_emit_intrinsic by stage with a general fallback.

Many intrinsics only apply to a particular stage (such as discard).
In other cases, we may want to interpret them differently based on
the stage (such as load_primitive_id or load_input).

The current method isn't that pretty - we handle all intrinsics in
one giant function.  Sometimes we assert on stage, sometimes we forget.
Different behaviors are handled via if-ladders based on stage.

This commit introduces new nir_emit_<stage>_intrinsic() functions,
and makes nir_emit_instr() call those.  In turn, those fall back to
the generic nir_emit_intrinsic() function for cases they don't want
to handle specially.

This makes it clear which intrinsics only exist in one stage, and makes
it easy to handle inputs/outputs differently for various stages.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
Reviewed-by: Jordan Justen <[email protected]>

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