[runtime/heap] Introduce CopyFixedArrayUpTo to match CopyFixedArrayAndGrow, copying to a smaller ar…

[runtime/heap] Introduce CopyFixedArrayUpTo to match CopyFixedArrayAndGrow, copying to a smaller array.

This allows the helper to avoid write barriers while copying, speeding up Object.keys by 5-10%.

BUG=

Committed: https://crrev.com/2646b62a5c2d393cf97f2128d5c0300473971a8c
Cr-Commit-Position: refs/heads/master@{#33916}

[Toon Verwaest, 2016-02-11 14:06:03]

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

[Toon Verwaest, 2016-02-11 14:06:03]

ptal

[Michael Lippautz, 2016-02-11 14:17:03]

LGTM

[Toon Verwaest, 2016-02-11 14:27:29]

The CQ bit was checked by verwaest@chromium.org

[commit-bot: I haz the power, 2016-02-11 14:27:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1690953002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1690953002/1

[commit-bot: I haz the power, 2016-02-11 15:17:54]

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

[commit-bot: I haz the power, 2016-02-11 15:17:55]

Failed to commit the patch.

[Toon Verwaest, 2016-02-11 18:57:26]

The CQ bit was checked by verwaest@chromium.org

[commit-bot: I haz the power, 2016-02-11 18:57:34]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1690953002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1690953002/1

[commit-bot: I haz the power, 2016-02-11 18:58:58]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-11 18:59:26]

Description was changed from

==========
[runtime/heap] Introduce CopyFixedArrayUpTo to match CopyFixedArrayAndGrow,
copying to a smaller array.

This allows the helper to avoid write barriers while copying, speeding up
Object.keys by 5-10%.

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

to

==========
[runtime/heap] Introduce CopyFixedArrayUpTo to match CopyFixedArrayAndGrow,
copying to a smaller array.

This allows the helper to avoid write barriers while copying, speeding up
Object.keys by 5-10%.

BUG=

Committed: https://crrev.com/2646b62a5c2d393cf97f2128d5c0300473971a8c
Cr-Commit-Position: refs/heads/master@{#33916}
==========

[commit-bot: I haz the power, 2016-02-11 18:59:27]

Patchset 1 (id:??) landed as
https://crrev.com/2646b62a5c2d393cf97f2128d5c0300473971a8c
Cr-Commit-Position: refs/heads/master@{#33916}