Revert "[vm/concurrency] Remove --(no-)enable-isolate-groups flag in Dart VM"

This reverts commit f8df8ca78eec7ef0b6456aaad190fc64e1151c2f.

Reason for revert: breaks google3 (b/205519688)

Original change's description:
> [vm/concurrency] Remove --(no-)enable-isolate-groups flag in Dart VM
> The --enable-isolate-groups flag has been turned on by-default for
> months now. In this CL we're going to remove the opt-out of this (which
> was possible by explicitly passing --no-enable-isolate-groups to the VM)
> TEST=Existing CI. Removes flag and simplifies runtime.
> Change-Id: I8706b9e30df437548a81846e75e67a658d6d49d4
> Reviewed-on:
> Reviewed-by: Alexander Aprelev <>
> Commit-Queue: Martin Kustermann <>

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Iabe6ccda6c184bb183b54a056d5011e657265d1d
Reviewed-by: Emmanuel Pellereau <>
Reviewed-by: Aske Simon Christensen <>
Commit-Queue: Emmanuel Pellereau <>
8 files changed
tree: a5709c20f24ba3f63709b268d1c3ec8aa8a45ac5
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. client/
  6. docs/
  7. pkg/
  8. runtime/
  9. samples/
  10. samples-dev/
  11. samples_2/
  12. sdk/
  13. tests/
  14. third_party/
  15. tools/
  16. utils/
  17. .clang-format
  18. .gitattributes
  19. .gitconfig
  20. .gitignore
  21. .gn
  22. .mailmap
  23. .packages
  24. .style.yapf
  25. .vpython
  29. codereview.settings
  31. DEPS
  35. README.dart-sdk
  37. sdk_args.gni


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