nir: Copy semantics to nir_intrinsic_load_fs_input_interp_deltas
When using nir_lower_interpolation, we need to propagate the IO
semantics from the load_interpolated_input to the new
load_fs_input_interp_deltas intrinsics. nir_lower_io assumes
they will be filled out.
This fixes assertions in most tests on iris since commit
01ab308edc78cda777bc66f2e8110fbd8c21aa18, where nir_lower_io
started reading this field.
Fixes: 01ab308edc7 ("nir: update IO semantics in nir_io_add_const_offset_to_base")
Fixes: 502abfce7f5 ("nir: save IO semantics in lowered IO intrinsics")
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6450>
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