[turbofan] Base JSCreateClosure comparison on location.

[turbofan] Base JSCreateClosure comparison on location.

This changes hashing and comparison functions for JSCreateClosure
operators to be based in the handle location instead of the referenced
object identity. This is in sync with all other JS operators.

R=bmeurer@chromium.org

Committed: https://crrev.com/b79f397f41f88a3db7413ff8cf822378eb62726f
Cr-Commit-Position: refs/heads/master@{#31225}

[Benedikt Meurer, 2015-10-12 17:54:09]

lgtm

[Michael Starzinger, 2015-10-13 07:41:49]

The CQ bit was checked by mstarzinger@chromium.org

[commit-bot: I haz the power, 2015-10-13 07:42:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1388233007/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1388233007/1

[commit-bot: I haz the power, 2015-10-13 07:43:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-13 07:44:00]

Patchset 1 (id:??) landed as
https://crrev.com/b79f397f41f88a3db7413ff8cf822378eb62726f
Cr-Commit-Position: refs/heads/master@{#31225}