Revise order of type variable declaration events

As of this CL, events for type variable declarations occur
in the following order:

* beginTypeVariables
* beginTypeVariable for each type variable in the declaration
* handleTypeVariablesDefined
* endTypeVariable for eah type variable in the declaration
* endTypeVariables

Revising the order of events facilitate removing the hack
in BodyBuilder.beginTypeVariables in a future CL.

This is another slice of https://dart-review.googlesource.com/c/sdk/+/57661
so that it can be landed in a more incremental fashion.

Change-Id: Ief0ad766c12f1ca9d53a8ec8d3c08b41166b2897
Reviewed-on: https://dart-review.googlesource.com/61940
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>
9 files changed
tree: 97ed59499c24cbf263195557430b6247f972097c
  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. AUTHORS
  22. BUILD.gn
  23. CHANGELOG.md
  24. codereview.settings
  25. dartdoc_options.yaml
  26. DEPS
  27. LICENSE
  28. PATENTS
  29. PRESUBMIT.py
  30. README.dart-sdk
  31. README.md
  32. WATCHLISTS
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