Fix parsing typedefs with <T>=

This is the first CL of several needed to fix typedef parsing
when there is no space between the type parameters and the `=`.

  typedef F<T>= T Function(T);

* Fix some typedef parsing failures
* Add new consts for simple type var ending with ">>" and ">="
* Update computeType and computeTypeParamOrArg to return new consts
* Extract splitGtEq/GtGt/GtGtEq from splitEndGroup
* Hide internal TypeInfo and TypeParamOrArgInfo consts

Change-Id: Ice550f5b15df1f3cad616a2a342644974f14d8ee
Reviewed-on: https://dart-review.googlesource.com/69261
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Dan Rubel <danrubel@google.com>
7 files changed
tree: 27189399e93f16353a622b0d63d56a106a9357ca
  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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