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Do nothing for OpExtInst from extended instruction sets that name start with "NonSemantic.". Since they can be used within the "preamble" to annotate global decorations, also don't stop iterating when one of them is found. Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> Tested-by: Marge Bot <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3154> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3154>