avx vnni int8, avx vnni int16, avx ne convert infrastructure

[nihui]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 61.11111% with 21 lines in your changes missing coverage. Please review.

Project coverage is 95.15%. Comparing base (e7602a2) to head (ded280e).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/cpu.cpp	61.11%	21 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5749      +/-   ##
==========================================
- Coverage   95.16%   95.15%   -0.01%     
==========================================
  Files         795      795              
  Lines      271217   271150      -67     
==========================================
- Hits       258096   258016      -80     
- Misses      13121    13134      +13     

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