Add user-visible runtimeCast method to Array and make related changes.
Created attachment 125742 [details] Patch
Sample files were mistakenly added to another bug: https://bugs.webkit.org/show_bug.cgi?id=77917
Created attachment 125860 [details] Patch
Committed r106957: <http://trac.webkit.org/changeset/106957>
Comment on attachment 125860 [details] Patch Patch landed, clearing r?