[X86] ReplaceNodeResults - relax the value type constraints for TRUNCATE widening
With SSSE3, widen the truncation for anything other than vXi64 -> vXi8 smaller than v8i64 (where PSHUFB would be better).
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With SSSE3, widen the truncation for anything other than vXi64 -> vXi8 smaller than v8i64 (where PSHUFB would be better).