[dartdevc] Fix ForElement downcasts and expected run time errors

* Move implicit cast generation on the for-in statement iterator to the code generator
  so it can be reused on the for-in element.

Issue: #36005
Change-Id: I0f77ff13dae032fa7fa1248f3c9338255ec9264b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/97349
Commit-Queue: Nicholas Shahan <nshahan@google.com>
Reviewed-by: Jenny Messerly <jmesserly@google.com>
2 files changed
tree: fc1d0945bb17b4a122ca2901a4248bc88fbc109b
  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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