Overwrite the handler using Set.
InsertAt apparently inserts by moving the other elements... that does not work.

Review URL: https://chromiumcodereview.appspot.com/14566007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14535 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove 'unanimous use observations' rule from Phi representation inference

Review URL: https://codereview.chromium.org/14840014

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14536 ce2b1a6d-e550-0410-aec6-3dcde31c8c00