Replaces two non-private uses of AddProperty with IgnoreAttributesAndSetLocalProperty.  Adds attributes parameter to IgnoreAtt..Property().  Makes IgnoreAtt..Property() an exact clone of SetProperty(), with explicit changes.

Review URL: http://codereview.chromium.org/5665

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@411 ce2b1a6d-e550-0410-aec6-3dcde31c8c00