dartdev, --enable-vm-service and script arguments

[jensjoha]

I tried running out/ReleaseX64/dart --enable-vm-service --enable-asserts pkg/front_end/tool/_fasta/compile.dart --omit-platform --target=none --dump-ir t.dart but dartdev told me Could not find an option named "omit-platform".

And no, dartdev probably doesn't know about that, but it isn't supposed to, it's an argument to the script I'm running. Namely I just added "--enable-vm-service" to the command line I was already running as I would like to start a debugging session. That's the way it used to work, and I haven't been told otherwise so I'd expect it to still be the case.

(Adding --disable_dart_dev solved my problem for now)

[a-siva]

/cc @bkonyi