spirv: Implement OpCopyObject and OpCopyLogical as blind copies

spirv: Implement OpCopyObject and OpCopyLogical as blind copies

Because the types etc. are required to logically match, we can just
copy-propagate the guts of the vtn_value.  This was causing issues with
some new CTS tests that are doing an OpCopyObject of a sampler which is
a special-cased type in spirv_to_nir.  Of course, this is only a partial
solution.  Ideally, we've got a bit of work to do to make all the
composite stuff able to handle all types including images, sampler, and
combined image/samplers but this gets some CTS tests passing.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Acked-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4375>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4375>