Created attachment 646792 [details] [diff] [review]
Currently the only extra arg we need is for debugMode, so we just tack a -d onto the command before we execute it. When we support |jit-test| and --jitflags, we are going to need many more of these, so we should store them in an options list like jit-tests does.
Push backed out for bustage:
Green try run at: