Merged r15641 into 3.19 branch.

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

BUG=259366
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/19573003

git-svn-id: https://v8.googlecode.com/svn/branches/3.19@15718 ce2b1a6d-e550-0410-aec6-3dcde31c8c00