Merged r15641 into 3.18 branch.

Fall back to generic on access checks in JSON.stringify.

Also fixes some presubmit check failures.

BUG=259366
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/19578002

git-svn-id: https://v8.googlecode.com/svn/branches/3.18@15720 ce2b1a6d-e550-0410-aec6-3dcde31c8c00