Fix bogus call to Object.hasOwnProperty in Array builtin.

R=mvstanton@chromium.org
TEST=mjsunit/regress/regress-builtinbust-5

Review URL: https://codereview.chromium.org/239033002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20766 ce2b1a6d-e550-0410-aec6-3dcde31c8c00