fix: to_bitmask return uint32_t to avoid sign extend int to uint64

[xiegx94]

There is a bug in SkipString that caused by cast int to uint64.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6fabefe) 95.77% compared to head (9ba094f) 95.77%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #83   +/-   ##
=======================================
  Coverage   95.77%   95.77%           
=======================================
  Files          21       21           
  Lines        2435     2435           
=======================================
  Hits         2332     2332           
  Misses        103      103           

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[qshanz373]

int _mm_movemask_epi8(__m128i a)

Shall we do the zext at the place that we call it, instead of changing the return type ?

[xiegx94]

int _mm_movemask_epi8(__m128i a)

Shall we do the zext at the place that we call it, instead of changing the return type ?

Sonic has some to_bitmask functions and all of them should return same sign or unsign type.

[qshanz373]

LGTM now