[stubs]: Convert FastNewContext stub to turbofan

[stubs]: Convert FastNewContext stub to turbofan

BUG=608675
Committed: https://crrev.com/8ab0e99eb84ee01af253b50f34cd8b2b0f785cae
Cr-Commit-Position: refs/heads/master@{#37550}

[danno, 2016-07-06 08:37:58]

danno@chromium.org changed reviewers:
+ bmeurer@chromium.org, mvstanton@chromium.org

[danno, 2016-07-06 08:37:58]

PTAL

[Benedikt Meurer, 2016-07-06 10:24:02]

It'd be nice to apply the same cleanup that we used for FastNewClosureStub and
compute the slot count within the stub instead of having that as a minor key,
then we can use that stub also for the interpreter. But that can be a separate
CL.

One nit I'd like to see addressed tho: Please rename this stub to
FastNewFunctionContextStub, then it's obvious from the name which kind of
context this thing creates.

Otherwise LGTM on the conversion.

[danno, 2016-07-06 10:34:46]

Totally agree on the cleanup, but I wanted to save that for a separate CL. There
is some subtlety to making sure that it's still fast enough.

I'll fix the name.

[danno, 2016-07-06 11:22:08]

The CQ bit was checked by danno@chromium.org

[danno, 2016-07-06 11:22:09]

The patchset sent to the CQ was uploaded after l-g-t-m from bmeurer@chromium.org
Link to the patchset: https://codereview.chromium.org/2113673002/#ps40001
(title: "Rename based on feedback")

[commit-bot: I haz the power, 2016-07-06 11:22:14]

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, 2016-07-06 11:46:28]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-07-06 11:49:14]

Description was changed from

==========
[stubs]: Convert FastNewContext stub to turbofan

BUG=608675
==========

to

==========
[stubs]: Convert FastNewContext stub to turbofan

BUG=608675

Committed: https://crrev.com/8ab0e99eb84ee01af253b50f34cd8b2b0f785cae
Cr-Commit-Position: refs/heads/master@{#37550}
==========

[commit-bot: I haz the power, 2016-07-06 11:49:15]

Patchset 3 (id:??) landed as
https://crrev.com/8ab0e99eb84ee01af253b50f34cd8b2b0f785cae
Cr-Commit-Position: refs/heads/master@{#37550}