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The vectorization pass can inject 32_2x16 (un)packing opcodes upon successful vectorization of 16-bit operations into 32-bit counterparts, so make sure we lower these to something our backend can handle. Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14648>