Support for function calls on an arbitrary expression that returns

Support for function calls on an arbitrary expression that returns
a function in the top-level compiler.

e.g.

function f() { return (function() { return true; }) }
f()()

Review URL: http://codereview.chromium.org/346029

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3196 ce2b1a6d-e550-0410-aec6-3dcde31c8c00