ssa: fix cvtType check types.Alias

[visualfc]

• fix cvtType for go1.22/1.23 GODEBUG=gotypesalias=1
• fix compiler build for go1.22 GODEBUG=gotypesalias=1

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.61%. Comparing base (745eff0) to head (ad796eb).
Report is 22 commits behind head on main.

Files with missing lines	Patch %	Lines
compiler/ssa/type_cvt.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #955      +/-   ##
==========================================
+ Coverage   81.58%   81.61%   +0.03%     
==========================================
  Files          53       53              
  Lines        9050     9067      +17     
==========================================
+ Hits         7383     7400      +17     
  Misses       1516     1516              
  Partials      151      151              

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