Update post-mortem metadata generation

Update post-mortem metadata generation

mdb_v8, a post-mortem debugger for Node.js, now uses JSArrayBuffer's
backing_store property and JSArrayBufferView's byte_offset property to
get access to the content of Buffer instances in node (which are
Uint8Array instances). This change adds post-mortem metadata for these
two properties.

This change also fixes a typo in
inobject_properties_of_constructor_function_index_offset that was added
to gen-postmortem-metadata in a previous change. It should be named
inobject_properties_or_constructor_function_index instead.

R=bmeurer@chromium.org

Committed: https://crrev.com/56a0a797f210e04746f2888116365d29a4bb6afc
Cr-Commit-Position: refs/heads/master@{#30926}

[julien.gilli, 2015-09-25 00:06:13]

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

[Benedikt Meurer, 2015-09-25 04:16:24]

lgtm

[julien.gilli, 2015-09-25 04:35:37]

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

[commit-bot: I haz the power, 2015-09-25 04:35:42]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1363403003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1363403003/1

[commit-bot: I haz the power, 2015-09-25 04:59:26]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-25 04:59:55]

Patchset 1 (id:??) landed as
https://crrev.com/56a0a797f210e04746f2888116365d29a4bb6afc
Cr-Commit-Position: refs/heads/master@{#30926}

[julien.gilli, 2015-09-25 05:14:41]

On 2015/09/25 04:16:24, Benedikt Meurer wrote:
> lgtm

Once again, thank you very much for the prompt review!