Establish an invariant on initial maps:

Establish an invariant on initial maps:
1) they always own descriptors,
2) the number of own descriptors is equal to the number of descriptors in the descriptor array.

This allows an initial map of a subclass to share descriptor array with initial map of the parent class (if it already contains properties).

BUG=chromium:551430
LOG=N

Committed: https://crrev.com/2ed1749091b91f0c8aef6d555f13d14e4089747f
Cr-Commit-Position: refs/heads/master@{#31892}

[Igor Sheludko, 2015-11-06 14:08:40]

The CQ bit was checked by ishell@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-11-06 14:08:44]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1411933005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1411933005/1

[Igor Sheludko, 2015-11-06 14:08:59]

ishell@chromium.org changed reviewers:
+ verwaest@chromium.org

[Igor Sheludko, 2015-11-06 14:08:59]

PTAL

[commit-bot: I haz the power, 2015-11-06 14:26:04]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-06 14:26:05]

Dry run: This issue passed the CQ dry run.

[Igor Sheludko, 2015-11-06 18:26:07]

Patchset #1 (id:1) has been deleted

[Igor Sheludko, 2015-11-06 18:32:15]

Description was changed from

==========
Incorrect assert removed from Map::CopyInitialMap().

BUG=chromium:551430
LOG=N
==========

to

==========
Establish an invariant on initial maps:
1) they always own descriptors,
2) the number of own descriptors is equal to the number of descriptors in the
descriptor array.

This allows an initial map of a subclass to share descriptor array with initial
map of the parent class (if it already contains properties).

BUG=chromium:551430
LOG=N
==========

[Igor Sheludko, 2015-11-06 18:32:22]

The CQ bit was checked by ishell@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-11-06 18:32:38]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1411933005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1411933005/20001

[commit-bot: I haz the power, 2015-11-06 19:19:18]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-06 19:19:18]

Dry run: This issue passed the CQ dry run.

[Toon Verwaest, 2015-11-09 16:08:53]

lgtm

[Igor Sheludko, 2015-11-09 16:10:02]

The CQ bit was checked by ishell@chromium.org

[commit-bot: I haz the power, 2015-11-09 16:10:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1411933005/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1411933005/20001

[commit-bot: I haz the power, 2015-11-09 16:26:58]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2015-11-09 16:27:23]

Patchset 1 (id:??) landed as
https://crrev.com/2ed1749091b91f0c8aef6d555f13d14e4089747f
Cr-Commit-Position: refs/heads/master@{#31892}