Make Object.freeze fast

Make Object.freeze fast

This patch both speeds up the freeze operation itself, but also
allows properties to remain in fast mode. Objects with non-empty
elements backing stores still end up with slow elements.

Relanding r14758 and r14759 with fix for Test262: only mark properties
and elements READ_ONLY if they are not JS setter/getters. Tightened up
tests to assert frozen-ness, and added targeted tests for the new code
(covering accessors).

BUG=v8:1858, 115960
R=verwaest@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=14762

[Toon Verwaest, 2013-05-23 06:43:38]

lgtm

[Toon Verwaest, 2013-05-23 07:06:08]

Committed patchset #1 manually as r14762 (presubmit successful).

[Toon Verwaest, 2013-05-23 07:07:07]

I landed it for you. Lets hope the buildbots stay green this time around.