[es6] Implement spec compliant ToName (actually ToPropertyKey).

[es6] Implement spec compliant ToName (actually ToPropertyKey).

This adds a %ToName runtime entry that uses the previously introduced
Object::ToName, which is based on the new Object::ToPrimitive method.
Also removes the need to expose ToName in various way via the builtins
and/or context.

Drive-by-fix: Let %HasProperty do the ToName conversion implicitly as
required.

BUG=v8:4307
LOG=n

Committed: https://crrev.com/c403ede42ab9ab8e1c6e6788de5c140b16502746
Cr-Commit-Position: refs/heads/master@{#30435}

[Benedikt Meurer, 2015-08-28 09:20:25]

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

[commit-bot: I haz the power, 2015-08-28 09:20:31]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1319133002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1319133002/1

[Benedikt Meurer, 2015-08-28 09:20:56]

bmeurer@chromium.org changed reviewers:
+ yangguo@chromium.org

[Benedikt Meurer, 2015-08-28 09:20:57]

Hey Yang,

Here's first followup cleanup for ToName. Easy peasy.
Please take a look.

Thanks,
Benedikt

[commit-bot: I haz the power, 2015-08-28 09:22:12]

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

[commit-bot: I haz the power, 2015-08-28 09:22:12]

Dry run: Try jobs failed on following builders:
  v8_win_nosnap_shared_compile_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_win_nosnap_shared_compil...)

[Benedikt Meurer, 2015-08-28 09:23:02]

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

[commit-bot: I haz the power, 2015-08-28 09:23:12]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1319133002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1319133002/1

[Yang, 2015-08-28 09:24:30]

On 2015/08/28 09:23:12, commit-bot: I haz the power wrote:
> Dry run: CQ is trying da patch. Follow status at
>  https://chromium-cq-status.appspot.com/patch-status/1319133002/1
> View timeline at
>  https://chromium-cq-status.appspot.com/patch-timeline/1319133002/1

lgtm.

[Benedikt Meurer, 2015-08-28 09:38:49]

The CQ bit was unchecked by bmeurer@chromium.org

[Benedikt Meurer, 2015-08-28 09:38:54]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-08-28 09:39:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1319133002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1319133002/1

[commit-bot: I haz the power, 2015-08-28 09:46:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-28 09:47:00]

Patchset 1 (id:??) landed as
https://crrev.com/c403ede42ab9ab8e1c6e6788de5c140b16502746
Cr-Commit-Position: refs/heads/master@{#30435}