ssa: closure use org signature

[visualfc]

• ssa: cvtFunc keep signature org variadic. ( toLLVMFunc variadic by NameValist )
• ssa: cvtClosure remove closureCtx param
• internal/abi: fix abi.Type.NumMethod
• internal/lib/reflect: call variadic check

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.55%. Comparing base (bab5c05) to head (8fb0dfa).
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #880   +/-   ##
=======================================
  Coverage   95.54%   95.55%           
=======================================
  Files          22       22           
  Lines        6246     6251    +5     
=======================================
+ Hits         5968     5973    +5     
  Misses        246      246           
  Partials       32       32           

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