codetools: small optimizations

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41262 4005530d-fff6-0310-9dd1-cebe43e6787f
codetools: identifier completion: fixed crash

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41263 4005530d-fff6-0310-9dd1-cebe43e6787f