statement has an update_dot_tree expression, apply it to
print_dot.
(print_input_section): Do not update print_dot if it would move
print_dot backwards.
(lang_do_assignments_1): If the output section statement has an
update_dot_tree expression apply it to dot.
* ld-scripts/overlay-size.t (end_of_bss_overlays): Define.
(end_of_text_overlays): Define.
(end_of_data_overlays): Define.
* ld-scripts/overlay-size-map.d: Add expected values for
end_of_bss_overlays, end_of_text_overlays and
end_of_data_overlays.
(is_elf_format): New, extracted from...
* ld-scripts/weak.exp: ...here.
* ld-scripts/overlay-size.exp: New test.
* ld-scripts/overlay-size.[tsd],
* ld-scripts/overlay-size-map.d: New files for it.