Add ScopeInfo constants to post-mortem metadata

Add ScopeInfo constants to post-mortem metadata

mdb_v8, a post-mortem debugging tool for Node.js, allows users to
inspect ScopeInfo structures in order to get more information about
closures.

Currently, it hardcodes the metadata it uses to find this information.
This change allows it to get this metadata from the node binary itself,
and thus to adapt to future changes made to the layout of the ScopeInfo
data structure.

BUG=

R=bmeurer@chromium.org

Committed: https://crrev.com/357e6b99ee3927cc075dd8d27c99b89d858f9dd5
Cr-Commit-Position: refs/heads/master@{#30843}

[julien.gilli, 2015-09-21 04:49:13]

julien.gilli@joyent.com changed reviewers:
+ danno@chromium.org, verwaest@chromium.org

[Benedikt Meurer, 2015-09-21 04:49:17]

lgtm

[julien.gilli, 2015-09-21 05:13:18]

The CQ bit was checked by julien.gilli@joyent.com

[commit-bot: I haz the power, 2015-09-21 05:13:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1350843003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1350843003/1

[julien.gilli, 2015-09-21 05:15:35]

On 2015/09/21 04:49:17, Benedikt Meurer wrote:
> lgtm

Thank you very much for the prompt review Benedikt, I really appreciate it!

[commit-bot: I haz the power, 2015-09-21 05:45:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-21 05:45:45]

Patchset 1 (id:??) landed as
https://crrev.com/357e6b99ee3927cc075dd8d27c99b89d858f9dd5
Cr-Commit-Position: refs/heads/master@{#30843}