Remove ConstantUseKind enum

There is nothing constructing a `ConstantUse` through any path with a
use kind of `Indirect`.

- Remove the kind field and the only place reading it. Treat it as
  always `DIRECT`.
- Remove the unused `mirrors` and `typeVariableMirror` constructors.
- Preserve other named constructors even though they behave identically to avoid
  losing context at use sites.
- Make the `hashCode` getter lazy since it is only forwarding to the `value`.

Change-Id: I69a36fac245c74794b65e617b8cdd445a937bbee
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/97343
Commit-Queue: Nate Bosch <nbosch@google.com>
Reviewed-by: Sigmund Cherem <sigmund@google.com>
2 files changed
tree: b7bbdb2c4cd26bc9a9f300a4a48ad7b5c4bf3bc0
  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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