Allow code to be cached in shared maps.

BUG=
R=ulan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/25486002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17045 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Encapsulate extra_ic_state in CallICs.

R=ulan@chromium.org

Review URL: https://chromiumcodereview.appspot.com/25263002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17046 ce2b1a6d-e550-0410-aec6-3dcde31c8c00