Improve execution time of cctest/test-types.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/239513009

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20798 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Handlify and convert Script accesssors to new API-style accessors.

BUG=
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/239223003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20799 ce2b1a6d-e550-0410-aec6-3dcde31c8c00