v8: cherry-pick JitCodeEvent patch from upstream

Original commit log follows:

    Meaningful name for builtins in JitCodeEvent API.

    Report builtins by name (e.g. "Builtin:ArgumentsAdaptorTrampoline")
    instead of labeling everything "Builtin:A builtin from the snapshot"

    Review URL: https://codereview.chromium.org/1216833002

PR-URL: https://github.com/nodejs/io.js/pull/2075


Reviewed-By: Trevor Norris <trev.norris@gmail.com>