fix: handle cases where a class is declared before defining

[Vipul-Cariappa]

Description

Look at the test.

Fixes # (issue)

Helps fix 1 test in cppyy.

Type of change

• Bug fix
• New feature
• Requires documentation updates

Testing

Included.

Checklist

• I have read the contribution guide recently

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.78%. Comparing base (3bc692b) to head (af0f82c).
⚠️ Report is 54 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #644      +/-   ##
==========================================
+ Coverage   78.77%   78.78%   +0.01%     
==========================================
  Files           9        9              
  Lines        3849     3851       +2     
==========================================
+ Hits         3032     3034       +2     
  Misses        817      817              

Files with missing lines	Coverage Δ
lib/CppInterOp/CppInterOp.cpp	86.68% <100.00%> (+0.01%)	⬆️

Files with missing lines	Coverage Δ
lib/CppInterOp/CppInterOp.cpp	86.68% <100.00%> (+0.01%)	⬆️

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[vgvassilev]

Lgtm!