Add OptimizedCodeEntry as a new heap object type. An optimized code entry represents an association between the native context, a function, optimized code, and the literals. Such associations are needed by the deoptimizer and optimized code cache to efficiently find related optimized code and functions for a given context or shared function info.

BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/23691002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16407 ce2b1a6d-e550-0410-aec6-3dcde31c8c00