Revert r19455 "Load target types and handlers before IC computation."

It caused performance regression in dromaeo/jslib.

BUG=346149
LOG=Y
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/179613002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19537 ce2b1a6d-e550-0410-aec6-3dcde31c8c00