[dart/vm] Fix inconsistencies in intermediate representation

Rationale:
Stricter graph checking found some dangling pointers
and missing updates. This CL fixes the omissions
and removes some bail-outs in the graph checker itself,
making the checker stricter and more consistent. Also
adds flag to control verification (avoid excessive runtimes
for large programs in general, but allows testing even
these through command line option).

https://github.com/dart-lang/sdk/issues/36893
https://github.com/dart-lang/sdk/issues/36894
https://github.com/dart-lang/sdk/issues/36895
https://github.com/dart-lang/sdk/issues/36899

Change-Id: If4357cb897484ddfdb60722525092198771ec90a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/102420
Reviewed-by: Aart Bik <ajcbik@google.com>
Commit-Queue: Aart Bik <ajcbik@google.com>
5 files changed
tree: 43d914fd21abb1117dfff872c3d40af87a666a69
  1. .github/
  2. build/
  3. client/
  4. docs/
  5. pkg/
  6. runtime/
  7. samples/
  8. samples-dev/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .packages
  21. .vpython
  22. AUTHORS
  23. BUILD.gn
  24. CHANGELOG.md
  25. codereview.settings
  26. CONTRIBUTING.md
  27. DEPS
  28. LICENSE
  29. PATENTS
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. WATCHLISTS
README.md

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