Use the correct address of the code object to calculate the offset from the code object start to a pc for an optimized frame.

BUG=
TEST=

Review URL: http://codereview.chromium.org//6759052

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7468 ce2b1a6d-e550-0410-aec6-3dcde31c8c00