Explicitly initialize Code::builtin_index

Explicitly initialize Code::builtin_index

Initialize Code::builtin_index to -1. This ensures that it is
non-negative for builtin code objects (since it is set by
Builtins::SetUp), and -1 for everything else.

BUG=

Committed: https://crrev.com/116667f73e93fc1cdbcff101cbdc3b518110b905
Cr-Commit-Position: refs/heads/master@{#38719}

[jgruber, 2016-08-18 12:48:31]

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

[commit-bot: I haz the power, 2016-08-18 12:48:33]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[jgruber, 2016-08-18 12:52:15]

jgruber@chromium.org changed reviewers:
+ jarin@chromium.org

[commit-bot: I haz the power, 2016-08-18 13:24:00]

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

[commit-bot: I haz the power, 2016-08-18 13:24:01]

Dry run: This issue passed the CQ dry run.

[Jarin, 2016-08-18 14:16:15]

lgtm

[jgruber, 2016-08-18 14:26:56]

The CQ bit was checked by jgruber@chromium.org

[commit-bot: I haz the power, 2016-08-18 14:27:08]

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, 2016-08-18 14:34:06]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-18 14:34:24]

Description was changed from

==========
Explicitly initialize Code::builtin_index

Initialize Code::builtin_index to -1. This ensures that it is
non-negative for builtin code objects (since it is set by
Builtins::SetUp), and -1 for everything else.

BUG=
==========

to

==========
Explicitly initialize Code::builtin_index

Initialize Code::builtin_index to -1. This ensures that it is
non-negative for builtin code objects (since it is set by
Builtins::SetUp), and -1 for everything else.

BUG=

Committed: https://crrev.com/116667f73e93fc1cdbcff101cbdc3b518110b905
Cr-Commit-Position: refs/heads/master@{#38719}
==========

[commit-bot: I haz the power, 2016-08-18 14:34:25]

Patchset 1 (id:??) landed as
https://crrev.com/116667f73e93fc1cdbcff101cbdc3b518110b905
Cr-Commit-Position: refs/heads/master@{#38719}