Introduce FLAG_vector_ics.
When FLAG_vector_ics is true, then AST nodes that use Load and KeyedLoad ICs
will allocate a type vector slot to store feedback information. Full codegen
will emit a load of the slot into a register if the flag is on.
Support is incomplete, right now the IC doesn't know how to use the feedback
slot.
R=verwaest@chromium.org
Review URL: https://codereview.chromium.org/
398053002
git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22500
ce2b1a6d-e550-0410-aec6-
3dcde31c8c00