[turbofan] Properly implement %_ClassOf intrinsic.

[turbofan] Properly implement %_ClassOf intrinsic.

The %_ClassOf intrinsic roughly corresponds to the deprecated ES5
[[Class]] internal property, and should not be used anymore ideally.
However since we still have quite a couple of uses of this intrinsic
in the self hosted JavaScript builtins, we would tank some builtins
like Map, Set, WeakMap, WeakSet, etc. quite significantly unless we
also support this intrinsic until the builtins are all migrated to
C++/CSA builtins.

R=yangguo@chromium.org
BUG=v8:5267
Review-Url: https://codereview.chromium.org/2647833004
Cr-Commit-Position: refs/heads/master@{#42530}
Committed: https://chromium.googlesource.com/v8/v8/+/3e4070930dddff8e53067141d60add6f5a15b44a

[Benedikt Meurer, 2017-01-20 06:27:24]

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

[commit-bot: I haz the power, 2017-01-20 06:27:26]

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

[Yang, 2017-01-20 06:34:19]

On 2017/01/20 06:27:23, Benedikt Meurer wrote:

lgtm. but so sad that we are introducing throw-away code.

[Benedikt Meurer, 2017-01-20 06:38:38]

On 2017/01/20 06:34:19, Yang wrote:
> On 2017/01/20 06:27:23, Benedikt Meurer wrote:
> 
> lgtm. but so sad that we are introducing throw-away code.

Well, we need to get this out the door first... :-(

[Benedikt Meurer, 2017-01-20 06:38:46]

The CQ bit was unchecked by bmeurer@chromium.org

[Benedikt Meurer, 2017-01-20 06:38:52]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2017-01-20 06:38:53]

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, 2017-01-20 07:01:53]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484894332186840, "parent_rev":
"4a88dfba4142fce63165c85792bf22019df3d71f", "commit_rev":
"3e4070930dddff8e53067141d60add6f5a15b44a"}

[commit-bot: I haz the power, 2017-01-20 07:01:58]

Description was changed from

==========
[turbofan] Properly implement %_ClassOf intrinsic.

The %_ClassOf intrinsic roughly corresponds to the deprecated ES5
[[Class]] internal property, and should not be used anymore ideally.
However since we still have quite a couple of uses of this intrinsic
in the self hosted JavaScript builtins, we would tank some builtins
like Map, Set, WeakMap, WeakSet, etc. quite significantly unless we
also support this intrinsic until the builtins are all migrated to
C++/CSA builtins.

R=yangguo@chromium.org
BUG=v8:5267
==========

to

==========
[turbofan] Properly implement %_ClassOf intrinsic.

The %_ClassOf intrinsic roughly corresponds to the deprecated ES5
[[Class]] internal property, and should not be used anymore ideally.
However since we still have quite a couple of uses of this intrinsic
in the self hosted JavaScript builtins, we would tank some builtins
like Map, Set, WeakMap, WeakSet, etc. quite significantly unless we
also support this intrinsic until the builtins are all migrated to
C++/CSA builtins.

R=yangguo@chromium.org
BUG=v8:5267

Review-Url: https://codereview.chromium.org/2647833004
Cr-Commit-Position: refs/heads/master@{#42530}
Committed:
https://chromium.googlesource.com/v8/v8/+/3e4070930dddff8e53067141d60add6f5a1...
==========

[commit-bot: I haz the power, 2017-01-20 07:01:59]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/3e4070930dddff8e53067141d60add6f5a1...