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
R=@trevnorris?
CI: https://jenkins-iojs.nodesource.com/view/iojs/job/iojs+any-pr+multi/92/