cl: add Context; rm cl.syminfo

[visualfc]

• add cl.Context
• rm cl.symInfo parser for comment

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 89.22%. Comparing base (29ec301) to head (1f5b4ba).

Files with missing lines	Patch %	Lines
compiler/internal/build/build.go	78.94%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #542      +/-   ##
==========================================
- Coverage   89.49%   89.22%   -0.28%     
==========================================
  Files          45       45              
  Lines        8618     8596      -22     
==========================================
- Hits         7713     7670      -43     
- Misses        739      759      +20     
- Partials      166      167       +1     

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