Use unsafe.Pointer instead of uintptr in encoder's VM

[goccy]

SSIA

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 55.31915% with 84 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.41%. Comparing base (a72016c) to head (59725f2).
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Additional details and impacted files

@@              Coverage Diff               @@
##           new-engine     #565      +/-   ##
==============================================
- Coverage       78.69%   78.41%   -0.28%     
==============================================
  Files              55       55              
  Lines           16721    16779      +58     
==============================================
  Hits            13158    13158              
- Misses           2923     2978      +55     
- Partials          640      643       +3     

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