Store JSGlobalProxy's identity hash directly on the proxy itself

Previously, the hash was stored on the underlying global object, since
it was stored in the hidden property table. This patch moves to an
implementation modeled on JSProxy, adding a new 'hash' field to JSGlobalProxy.

This allows storing the global proxy in a Map, Set, WeakMap, or WeakSet and
accessing it even after the proxy has been attached to a new global, which
is Firefox's current behavior and was the consensus of a recent thread on public-script-coord:
http://lists.w3.org/Archives/Public/public-script-coord/2014AprJun/0012.html

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/254433002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21150 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Tighten up Object.observe code to ASSERT that it never deals with globals

After r21126, Object.observe no longer allows observing the global proxy
object. This patch replaces codepaths that used to handle that case with
asserts showing that no such observation happens.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/261773006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21151 ce2b1a6d-e550-0410-aec6-3dcde31c8c00