ES6: Make function name configurable

ES6: Make function name configurable

Function name property is now standardized in ES6. It was a Mozilla proprietary
extension before. With ES6, the property was made configurable, so that it can
be used instead of another proprietary property, displayName.

This is a revert of revert https://chromium.googlesource.com/v8/v8.git/+/c791d8411225aa95518c880defd9a5b1ea243afc.

Last time this broke a Chrome browser test which has since been updated:

https://chromium.googlesource.com/chromium/src/+/5f75a3be4c9334aba627d6c5eb884adf965e1d78

BUG=v8:3333
LOG=N
R=mstarzinger@chromium.org,verwaest@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel

Committed: https://crrev.com/f6cd009efd7a032907b11265e74102b0d45207a1
Cr-Commit-Position: refs/heads/master@{#26996}

[arv (Not doing code reviews), 2015-03-04 10:24:24]

PTAL

There is no change to this CL from last time. Since last time I fixed the Chrome
browser test.

[arv (Not doing code reviews), 2015-03-04 12:35:54]

Ping.

This passes on the blink and chrome bots. It is ready to go.

[Toon Verwaest, 2015-03-04 16:02:59]

lgtm

[arv (Not doing code reviews), 2015-03-04 16:26:02]

The CQ bit was checked by arv@chromium.org

[commit-bot: I haz the power, 2015-03-04 16:26:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/977003004/1

[commit-bot: I haz the power, 2015-03-04 16:57:01]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-04 16:57:18]

Patchset 1 (id:??) landed as
https://crrev.com/f6cd009efd7a032907b11265e74102b0d45207a1
Cr-Commit-Position: refs/heads/master@{#26996}