Only a single constructor is really needed. Make UnaryOp_Patch's arguments
simpler, avoiding encoding/decoding things in a cryptic way.
Review URL: http://codereview.chromium.org/7248063

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8503 ce2b1a6d-e550-0410-aec6-3dcde31c8c00