JsValueIE6 now queries for IUnknown to determine unique pointer, per COM rules.  This makes JavaScriptObject$ identity match JavaScript object identity more closely.

Found by: ecc
Suggested by: bruce
Review by: bruce


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@2029 8db76d5a-ed1c-0410-87a9-c151d255dfc7