nir/lower_io: Add "explicit" IO lowering

This new pass is for lowering explicitly laid out memory coming in from
SPIR-V or a similar source.  It's quite a bit more complicated than the
normal lower_io because we have to be able to handle matrices.  The
way the stride information is stored for matrices is awkward and dealing
with row-major matrices is especially painful.

Reviewed-by: Alejandro Piñeiro <[email protected]>
Reviewed-by: Caio Marcelo de Oliveira Filho <[email protected]>

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