X64: Implement inline cache of monomorphic constant function call.  Mark a debugger test on X64 as failing.
Review URL: http://codereview.chromium.org/155631

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2485 ce2b1a6d-e550-0410-aec6-3dcde31c8c00