cl: prepare for compileTemplateClass

[xushiwei]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 54.37500% with 73 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.09%. Comparing base (20a5b8f) to head (3ebcaa5).
⚠️ Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
cl/class.go	48.71%	40 Missing ⚠️
cl/ctx.go	44.89%	27 Missing ⚠️
cl/type.go	64.28%	5 Missing ⚠️
cl/compile.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #870      +/-   ##
==========================================
- Coverage   85.48%   82.09%   -3.39%     
==========================================
  Files          22       22              
  Lines        1715     1798      +83     
==========================================
+ Hits         1466     1476      +10     
- Misses        249      322      +73     

Flag	Coverage Δ
llgo-tests	82.09% <54.37%> (-3.39%)	⬇️

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