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Supersize compares sections sizes between the map and elf files to
ensure they match. However, with partitioned libraries, some sections
are automatically generated when extracting the partitions from the
original combined library, and hence impossible to compare sizes.

Similarly, the map file contains duplicate sections for each partition.
Since SuperSize currently analyzes the main .elf, we need to ignore
sections (eg. .text) for the partitions. In the future, the script can
be improved to return section sizes for all partitions (ie. a set of
sets of section sizes).

Bug: 982334
Change-Id: I240d06bdaa405c9c1984ddf82e4244fc9df5dda2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1708201
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#679952}