[X86] LowerTRUNCATE - use LowerTruncateVecPackWithSignBits for prefer-256 bit...
[X86] LowerTRUNCATE - use LowerTruncateVecPackWithSignBits for prefer-256 bit AVX512 cases during type legalization If the AVX512 target will split the 512-bit vector truncation then try to use PACKSS/PACKUS first.
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