Changed computation of func.caller to skip some built-in functions.
Now skips built-in functions called from other built-in functions,
so only the initally called built-in function is exposed.

Make FromPropertyDescriptor not trigger inherited setters.

Review URL: http://codereview.chromium.org/7774008

git-svn-id: http://v8.googlecode.com/svn/branches/3.4@9036 ce2b1a6d-e550-0410-aec6-3dcde31c8c00