fix overload methods of generic type

[visualfc]

fix goplus/gop#1396

const GopPackage = true

type Data[T any] struct {
	v T
}

func (p *Data[T]) Foo__0() {
}
func (p *Data[T]) Foo__1(a string, t T) {
}

NewOverloadMethod

recv type: *overloadFuncType
recv name: __gop_overload__:Foo__0;Foo__1
func (name type) Foo()

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (b1467c0) 94.47% compared to head (998bfa3) 94.49%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #255      +/-   ##
==========================================
+ Coverage   94.47%   94.49%   +0.01%     
==========================================
  Files          14       14              
  Lines        6338     6355      +17     
==========================================
+ Hits         5988     6005      +17     
  Misses        282      282              
  Partials       68       68              

Impacted Files	Coverage Δ
codebuild.go	95.93% <100.00%> (+0.02%)	⬆️
func.go	97.43% <100.00%> (+0.04%)	⬆️

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