nir/lower_io_to_scalar: update io semantics on per-component inst

When we replace the original instruction with per-channel operations,
the new instruction should inherint the semantics of the original
instruction.

Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6721>
1 file changed