[examples] eight 32-bit versions of trailing zeros from Hacker's Delight

[bendyarm]

Leo implementations in 32 bits of all 8 of the illustrated number of trailing zeros (ntz) algorithms from Hacker's Delight 2nd ed., section 5-4.

[codecov[bot]]

Codecov Report

Merging #2001 (ae8b3b8) into testnet3 (c1d21e6) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##           testnet3    #2001   +/-   ##
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  Coverage     81.93%   81.93%           
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  Files           144      144           
  Lines          6427     6427           
  Branches       6426     6426           
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  Hits           5266     5266           
  Misses         1161     1161           

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