Use Type in CheckPrototypes.

R=ishell@chromium.org

Review URL: https://chromiumcodereview.appspot.com/78023002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18024 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Only use Type for compiling load handlers.

BUG=
R=ishell@chromium.org

Review URL: https://chromiumcodereview.appspot.com/80693002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18025 ce2b1a6d-e550-0410-aec6-3dcde31c8c00