Revise fasta type arg/param parsing to ignore "<".endGroup

The scanner associates '<' with '>' and '>>',
but the parser cannot use '<'.endToken/endGroup reliably
and wastes time updating that token's endToken/endGroup field.

This CL updates type info parsing to ignore '<'.endGroup
and step through the token stream (which it has to do anyway),
for improved parsing.

This CL causes a handful of existing tests to fail (marked as @failingTest)
and test failures will be addressed in a subsequent CL.

Change-Id: I788e9a74cd2891f98f44bba15d5669febfec6c64
Reviewed-on: https://dart-review.googlesource.com/70001
Commit-Queue: Dan Rubel <danrubel@google.com>
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
10 files changed
tree: c6416557f097e73fd3539968f54aef79e09aa961
  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. CONTRIBUTING.md
  26. dartdoc_options.yaml
  27. DEPS
  28. LICENSE
  29. PATENTS
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. WATCHLISTS
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