gen-accessors: update dumping of getters

[alexandear]

After merging this PR, the checks for #3433 will become green (I checked here).

The PR addresses the issue described in #3433 (comment): we need to guarantee the order of equal getters.

func (s *SMTP) GetUsername() string {
	if s == nil || s.Username == nil {
		return ""
	}
	return *s.Username
}

// GetUserName returns the UserName field if it's non-nil, zero value otherwise.
func (s *SMTP) GetUserName() string {
	if s == nil || s.UserName == nil {
		return ""
	}
	return *s.UserName
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.26%. Comparing base (2b8c7fa) to head (ec4431e).
Report is 223 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3437      +/-   ##
==========================================
- Coverage   97.72%   92.26%   -5.46%     
==========================================
  Files         153      174      +21     
  Lines       13390    15023    +1633     
==========================================
+ Hits        13085    13861     +776     
- Misses        215     1068     +853     
- Partials       90       94       +4     

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[gmlewis]

Thank you, @alexandear !
LGTM.
Merging.