Report the declaration file name even for class that do not have a TClass bootstrap (but are known to the in-memory AST, i.e. are 'interpreted')


git-svn-id: https://root.cern.ch/svn/root/trunk@48489 27541ba8-7e3a-0410-8455-c3a389f83636
Use of TClingClassInfo::FileName in TClass requires it to provide long term storage for the result


git-svn-id: https://root.cern.ch/svn/root/trunk@48490 27541ba8-7e3a-0410-8455-c3a389f83636