[WIP] build: env LLGO_CHECK=1 for llc check module

[visualfc]

env set LLGO_CHECK=1
check pkg by llc -filetype=null input.ll

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.64%. Comparing base (cb8e820) to head (0b3ce5f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #906   +/-   ##
=======================================
  Coverage   97.64%   97.64%           
=======================================
  Files          22       22           
  Lines        6279     6279           
=======================================
  Hits         6131     6131           
  Misses        128      128           
  Partials       20       20           

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