Pretty printing for array code stubs. The minor keys encode things like specialized ElementsKind for each stub. This can be useful to see in disassembly traces.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/110103002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18369 ce2b1a6d-e550-0410-aec6-3dcde31c8c00