codetools: utility function

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42250 4005530d-fff6-0310-9dd1-cebe43e6787f
lazutils: comments

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42251 4005530d-fff6-0310-9dd1-cebe43e6787f