[builtins] Add EmitFastNewObject

[builtins] Add EmitFastNewObject

This refactors the logic from within the FastNewObject TF_BUILTIN to a 
helper method which can be reused in other assemblers. This saves the 
overhead of setting up the stub and calling into it.

A wrapper method is created for functions that don't need to tail call
into the runtime.

PromiseBuiltinsAssembler and RegexpBuiltinsAssembler are refactored to
use EmitFastNewObject.

Review-Url: https://codereview.chromium.org/2607233002
Cr-Commit-Position: refs/heads/master@{#42000}
Committed: https://chromium.googlesource.com/v8/v8/+/2077b314d5d5632da29262f610cd70c3c9536515

[gsathya, 2016-12-30 08:59:21]

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

[commit-bot: I haz the power, 2016-12-30 08:59:30]

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

[gsathya, 2016-12-30 09:02:32]

Description was changed from

==========
[builtins] Add EmitFastNewObject

This refactors the logic from within the TF_BUILTIN to a helper method
which can be reused in other assemblers. This saves the overhead of
setting up the stub and calling into it.

A wrapper method is created for functions that don't need to tail call
into the runtime.

PromiseBuiltinsAssembler and RegexpBuiltinsAssembler are refactored to
use EmitFastNewObject.
==========

to

==========
[builtins] Add EmitFastNewObject

This refactors the logic from within the FastNewObject TF_BUILTIN to a 
helper method which can be reused in other assemblers. This saves the 
overhead of setting up the stub and calling into it.

A wrapper method is created for functions that don't need to tail call
into the runtime.

PromiseBuiltinsAssembler and RegexpBuiltinsAssembler are refactored to
use EmitFastNewObject.
==========

[gsathya, 2016-12-30 09:02:32]

gsathya@chromium.org changed reviewers:
+ ishell@chromium.org, mvstanton@chromium.org

[gsathya, 2016-12-30 09:19:14]

wdyt? worth it?

[commit-bot: I haz the power, 2016-12-30 09:23:57]

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

[commit-bot: I haz the power, 2016-12-30 09:23:58]

Dry run: This issue passed the CQ dry run.

[mvstanton, 2016-12-30 10:20:12]

I think it's good to eliminate a stub call. I'm happy to give
  LGTM

Thanks!
--Michael

[gsathya, 2016-12-30 10:27:54]

The CQ bit was checked by gsathya@chromium.org

[commit-bot: I haz the power, 2016-12-30 10:28:04]

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, 2016-12-30 10:29:40]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1483093674151960, "parent_rev":
"1542a47f596cfc23a08ab644e76621e3092276e6", "commit_rev":
"2077b314d5d5632da29262f610cd70c3c9536515"}

[commit-bot: I haz the power, 2016-12-30 10:29:45]

Description was changed from

==========
[builtins] Add EmitFastNewObject

This refactors the logic from within the FastNewObject TF_BUILTIN to a 
helper method which can be reused in other assemblers. This saves the 
overhead of setting up the stub and calling into it.

A wrapper method is created for functions that don't need to tail call
into the runtime.

PromiseBuiltinsAssembler and RegexpBuiltinsAssembler are refactored to
use EmitFastNewObject.
==========

to

==========
[builtins] Add EmitFastNewObject

This refactors the logic from within the FastNewObject TF_BUILTIN to a 
helper method which can be reused in other assemblers. This saves the 
overhead of setting up the stub and calling into it.

A wrapper method is created for functions that don't need to tail call
into the runtime.

PromiseBuiltinsAssembler and RegexpBuiltinsAssembler are refactored to
use EmitFastNewObject.

Review-Url: https://codereview.chromium.org/2607233002
Cr-Commit-Position: refs/heads/master@{#42000}
Committed:
https://chromium.googlesource.com/v8/v8/+/2077b314d5d5632da29262f610cd70c3c95...
==========

[commit-bot: I haz the power, 2016-12-30 10:29:46]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/2077b314d5d5632da29262f610cd70c3c95...