1. Make it work correctly with anonymous unions.
2. Don't compute it if the warning isn't enabled.
3. Optimize the algorithm slightly to make it linear time in the
case where we don't produce any warnings.
llvm-svn: 76630
in their order of construction for each class and use it
to to check on propery order of base class construction
under -Wreorder option.
llvm-svn: 75270
Mike Stump