[LoadIC] Use LoadIC_Uninitialized for 0->PRE transitions

[LoadIC] Use LoadIC_Uninitialized for 0->PRE transitions

Avoiding runtime call overhead.
There's a fast path for Function.prototype loads, which are very common.

BUG=v8:5269
Review-Url: https://codereview.chromium.org/2711353002
Cr-Commit-Position: refs/heads/master@{#43474}
Committed: https://chromium.googlesource.com/v8/v8/+/2585ee06efb1b3051903451272959d083397295a

[Jakob Kummerow, 2017-02-24 11:56:31]

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

[Jakob Kummerow, 2017-02-24 11:56:32]

PTAL.

[Igor Sheludko, 2017-02-27 09:51:25]

lgtm

[Jakob Kummerow, 2017-02-28 10:35:07]

The CQ bit was checked by jkummerow@chromium.org

[commit-bot: I haz the power, 2017-02-28 10:35:13]

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, 2017-02-28 11:04:05]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488278107293900, "parent_rev":
"f6e7bc4decb3ae3d9ef81eb5cebb5926277e88a5", "commit_rev":
"2585ee06efb1b3051903451272959d083397295a"}

[commit-bot: I haz the power, 2017-02-28 11:04:13]

Description was changed from

==========
[LoadIC] Use LoadIC_Uninitialized for 0->PRE transitions

Avoiding runtime call overhead.
There's a fast path for Function.prototype loads, which are very common.

BUG=v8:5269
==========

to

==========
[LoadIC] Use LoadIC_Uninitialized for 0->PRE transitions

Avoiding runtime call overhead.
There's a fast path for Function.prototype loads, which are very common.

BUG=v8:5269

Review-Url: https://codereview.chromium.org/2711353002
Cr-Commit-Position: refs/heads/master@{#43474}
Committed:
https://chromium.googlesource.com/v8/v8/+/2585ee06efb1b3051903451272959d08339...
==========

[commit-bot: I haz the power, 2017-02-28 11:04:14]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/2585ee06efb1b3051903451272959d08339...