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[X86][Costmodel] `trunc v8i64 to v16i8/v32i8/v64i8` can appear after legalization, cost is same as for `trunc v8i64 to v8i8`
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Authored by lebedev.ri on Sun, Nov 14, 10:08 AM.

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Summary

While this one is trivial and identical to the previous patch,
there is a weird cost change in a follow-up patch that i'm not sure about.

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