Revert "LLDB needs access to RecordDecl::LoadedFieldsFromExternalStorage member variable. Adding accessors to this variable."
This reverts commit 70949ee8bfb57a1c546b9d4e4001aed94a1f10c9.
This was upstreamed in revision (r254451) into a different part of the
file. By reverting this commit, we still have the functionality, no
duplicate declarations, and hopefully less merge conflicts since the
member variable that is in tree is in the place that it was upstreamed.