[vm/compiler] avoid literal null is non-nullable

Rationale:
Having a literal null checked by CheckNull with
a subsequent Redefinition resulted in some strange
unboxing that crashed AOT (fix courtesy Slava!).
Note that we still have some ambiguity around
adding/removing environments from instructions
that may deoptimize, but this change fixes all
prior related DartFuzz failures.

https://github.com/dart-lang/sdk/issues/35335

Change-Id: Ifb50d8cddf93e57758b2bbb83ad397ea281e9307
Reviewed-on: https://dart-review.googlesource.com/c/87280
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Commit-Queue: Aart Bik <ajcbik@google.com>
1 file changed
tree: 325bf67ba8680912c335368b7bbd8349ae7cafed
  1. .clang-format
  2. .gitattributes
  3. .gitconfig
  4. .github/
  5. .gitignore
  6. .gn
  7. .mailmap
  8. .packages
  9. .vpython
  10. AUTHORS
  11. BUILD.gn
  12. CHANGELOG.md
  13. CONTRIBUTING.md
  14. DEPS
  15. LICENSE
  16. PATENTS
  17. PRESUBMIT.py
  18. README.dart-sdk
  19. README.md
  20. WATCHLISTS
  21. build/
  22. client/
  23. codereview.settings
  24. dartdoc_options.yaml
  25. docs/
  26. pkg/
  27. runtime/
  28. samples-dev/
  29. samples/
  30. sdk/
  31. tests/
  32. third_party/
  33. tools/
  34. utils/
README.md

Dart

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Using Dart

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