Create a star symbol for gaps at the start & end of sections

Create a star symbol for gaps at the start & end of sections

This eliminates the chance of a diff coming up where the symbols do not
sum up to the entire section delta

Other misc changes here:
 * Improves the size summary messaging.
 * Kills nm subprocess upon exit (rather than letting process finish)
 * Allows linker maps to not have a Common Symbols section

BUG=714180
Review-Url: https://codereview.chromium.org/2858793002
Cr-Commit-Position: refs/heads/master@{#469017}
Committed: https://chromium.googlesource.com/chromium/src/+/2de1cc0bc6bfc831331f083e8434f15c11ad9021

[agrieve, 2017-05-02 23:06:40]

Description was changed from

==========
Create a star symbol for gaps at the start & end of sections

This eliminates the chance of a diff coming up where the symbols do not
sum up to the entire section delta

Other misc changes here:
 * Improves the size summary messaging.
 * Kills nm subprocess upon exit (rather than letting process finish)
 * Allows linker maps to not have a Common Symbols section

BUG=714180
==========

to

==========
Create a star symbol for gaps at the start & end of sections

This eliminates the chance of a diff coming up where the symbols do not
sum up to the entire section delta

Other misc changes here:
 * Improves the size summary messaging.
 * Kills nm subprocess upon exit (rather than letting process finish)
 * Allows linker maps to not have a Common Symbols section

BUG=714180
==========

[agrieve, 2017-05-02 23:06:40]

agrieve@chromium.org changed reviewers:
+ estevenson@chromium.org

[agrieve, 2017-05-02 23:06:47]

On 2017/05/02 23:06:40, agrieve wrote:
> mailto:agrieve@chromium.org changed reviewers:
> + mailto:estevenson@chromium.org

🐛

[estevenson, 2017-05-03 17:02:50]

lgtm

[agrieve, 2017-05-03 17:10:42]

The CQ bit was checked by agrieve@chromium.org

[commit-bot: I haz the power, 2017-05-03 17:11:29]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-05-03 17:23:12]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493831442113850, "parent_rev":
"e01cd8a6d0e2addaca41d6e686d566d5050656a0", "commit_rev":
"2de1cc0bc6bfc831331f083e8434f15c11ad9021"}

[commit-bot: I haz the power, 2017-05-03 17:23:27]

Description was changed from

==========
Create a star symbol for gaps at the start & end of sections

This eliminates the chance of a diff coming up where the symbols do not
sum up to the entire section delta

Other misc changes here:
 * Improves the size summary messaging.
 * Kills nm subprocess upon exit (rather than letting process finish)
 * Allows linker maps to not have a Common Symbols section

BUG=714180
==========

to

==========
Create a star symbol for gaps at the start & end of sections

This eliminates the chance of a diff coming up where the symbols do not
sum up to the entire section delta

Other misc changes here:
 * Improves the size summary messaging.
 * Kills nm subprocess upon exit (rather than letting process finish)
 * Allows linker maps to not have a Common Symbols section

BUG=714180

Review-Url: https://codereview.chromium.org/2858793002
Cr-Commit-Position: refs/heads/master@{#469017}
Committed:
https://chromium.googlesource.com/chromium/src/+/2de1cc0bc6bfc831331f083e8434...
==========

[commit-bot: I haz the power, 2017-05-03 17:23:28]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/2de1cc0bc6bfc831331f083e8434...