Fix type feedback for name-keyed stores

BUG=chromium:422212
LOG=n
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/648703002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24529 ce2b1a6d-e550-0410-aec6-3dcde31c8c00