PR 3625.
* tapsets.cxx (dwflpp::print_locals): New function to print all
the variables/parameters of a function.
(dwflpp::find_variable_and_frame_base): Calls print_locals() when
target variable can't be found.
(dwflpp::print_members): New function to print all the members of
a union/structure.
(dwflpp::translate_components) Calls print_members() when
union/structure member target variable reference can't be found.