style: include IMC_IMMATURE_CLASS_VAR_NAME

[vil02]

Continuation of #5126.

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.70%. Comparing base (5e4db7b) to head (11cb74b).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #5197   +/-   ##
=========================================
  Coverage     38.70%   38.70%           
  Complexity     2384     2384           
=========================================
  Files           517      517           
  Lines         15403    15403           
  Branches       2960     2960           
=========================================
  Hits           5961     5961           
  Misses         9156     9156           
  Partials        286      286           

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