[es6] Use the correct ToPrimitive in the Date Constructor.

[es6] Use the correct ToPrimitive in the Date Constructor.

This way we can finally remove the ES5 ToPrimitive builtin from
runtime.js, and the Date Constructor now properly supports
@@toPrimitive for the single argument case as well.

CQ_INCLUDE_TRYBOTS=tryserver.v8:v8_linux_layout_dbg,v8_linux_nosnap_dbg
R=rossberg@chromium.org
BUG=v8:4307
LOG=n

Committed: https://crrev.com/90e1a0ddb328f566d444e25c26b0550ee56a67e8
Cr-Commit-Position: refs/heads/master@{#30832}

[Benedikt Meurer, 2015-09-18 12:03:54]

Hey Andreas,

Easy fix and cleanup.  Please take a look.

Thanks,
Benedikt

[Benedikt Meurer, 2015-09-18 12:03:59]

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

[commit-bot: I haz the power, 2015-09-18 12:04:03]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1346893003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1346893003/1

[rossberg, 2015-09-18 12:08:43]

lgtm

[Benedikt Meurer, 2015-09-18 12:08:52]

The CQ bit was unchecked by bmeurer@chromium.org

[Benedikt Meurer, 2015-09-18 12:08:58]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-09-18 12:09:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1346893003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1346893003/1

[commit-bot: I haz the power, 2015-09-18 13:20:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-18 13:20:46]

Patchset 1 (id:??) landed as
https://crrev.com/90e1a0ddb328f566d444e25c26b0550ee56a67e8
Cr-Commit-Position: refs/heads/master@{#30832}