Fix loading non-configurable non-writable value from a constant with mismatching type feedback

BUG=410209
LOG=n
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/534093003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23650 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Enable access checks when loading properties through the API

BUG=
R=haraken@chromium.org

Review URL: https://codereview.chromium.org/532683002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23651 ce2b1a6d-e550-0410-aec6-3dcde31c8c00