Turn off tracking of fields for the roll.
Revert polymorphic stores suspect of crashes.

Revert "Turn on tracking of fields."
Revert "Turn polymorphic stores monomorphic if store sequence matches."
Revert "Fix polymorphic store."

R=danno@chromium.org

Review URL: https://chromiumcodereview.appspot.com/14812010

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14593 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Always generalize all representations when no transition is inserted.

R=danno@chromium.org

Review URL: https://chromiumcodereview.appspot.com/14696016

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14594 ce2b1a6d-e550-0410-aec6-3dcde31c8c00