A cooperative matrix can only be constructed from a single
scalar value. Print that value, wrapped by a function call that
looks like a type-constructor.
This adds a test case that will otherwise assert out in spirv2nir.
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35757>
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