Push bleeding_edge r1758 and r1764 to trunk.

This fixes performance problem when using hidden values as well as a
String.prototype.replace problem that broke zillow.com.
Review URL: http://codereview.chromium.org/93012

git-svn-id: http://v8.googlecode.com/svn/trunk@1765 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
5 files changed