[X86][AVX512VPOPCNTDQ] Improve support for v16i8/v8i16/v16i16/ CTPOP
Zero extend to v16i32/v8i64, use VPOPCNTDQ instructions and truncate back. llvm-svn: 306990
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Zero extend to v16i32/v8i64, use VPOPCNTDQ instructions and truncate back. llvm-svn: 306990