Do not use ISymUnmanagedReader.GetDocument. It is broken if two files have the same name.
Do not use ISymUnmanagedMethod.GetOffset. It sometimes returns negative offset.
git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@3135 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61