- Makes a common superclass for Load and Store stub compiler.
- Splits all non-normal Store ICs into handler and IC.
- Ensures monomorphic store ICs go polymorphic.
- Feeds polymorphic type feedback into count operation.

R=ulan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/14142005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15566 ce2b1a6d-e550-0410-aec6-3dcde31c8c00