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Previously SuperSize-archive focuses on section sizes and largely
ignores section addresses. As a result, "** ELF Section" symbols all
have address of 0. This CL refactors archive.py so that |section_range|
(2-tuple of address and size) become a primary object of interest, and
replaces widespread |section_size| usage. Details:
* linker_map_parser.py: Changes to store and return section ranges.
  * Requires test output update.
* archive.py: Extensive changes to use ranges throughout.
  * Add _ExtendSectionRange() helper.
  * _AddUnattributedSectionSymbols(): Add "** ELF Section" symbols in
    section name order, to make later sorting more predictable.
* Not changed: CreateSectionSizesAndSymbols() params, to maintain
  .size format compatibility.

"** ELF Section:" symbols can now have non-0 addresse (and better
sort order). This required update of integration_test.py expected
outputs.

Other changes:
* Add dbg.py to aid debugging (compatible with Python 3).

Change-Id: Ife5a695a4d3d75a6c67dabae5de91c9bb9618100
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2099466Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749544}