Merged r16139 into trunk branch.

Make all load-named-fields depend on their map-check, unless explicitly ignored.

R=danno@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/22880004

git-svn-id: https://v8.googlecode.com/svn/trunk@16157 ce2b1a6d-e550-0410-aec6-3dcde31c8c00