[vm] Support redirecting external const factories

This CL introduces the first combination of `external const factory`
with `@patch const factory (.*) = (.*)`. This specific combination was
never used in the core libraries, and did not work.

Half of the fix is a missing flag from the CFE:

The other half of the fix is matching on the
kRedirectingFactoryConstructor tag, and allowing constructor names
in procedure targets (even though we never compile those expressions
because they are invalid).

Bug: https://github.com/dart-lang/sdk/issues/45101

TEST=Using redirecting const factory in patch file in core lib.

Change-Id: I5524bde928290bf32aaea9170eda1f2d03127fa6
Cq-Include-Trybots: luci.dart.try:benchmark-linux-try,front-end-linux-release-x64-try,vm-kernel-linux-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/187003
Commit-Queue: Daco Harkes <dacoharkes@google.com>
Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
Reviewed-by: Clement Skau <cskau@google.com>
8 files changed
tree: 807d9b685fc4d3c2c81cf88f587af51a6be913da
  1. .clang-format
  2. .dart_tool/
  3. .gitattributes
  4. .gitconfig
  5. .github/
  6. .gitignore
  7. .gn
  8. .mailmap
  9. .packages
  10. .style.yapf
  11. .vpython
  13. BUILD.gn
  14. CHANGELOG.md
  16. DEPS
  19. PRESUBMIT.py
  20. README.dart-sdk
  21. README.md
  23. benchmarks/
  24. build/
  25. client/
  26. codereview.settings
  27. docs/
  28. pkg/
  29. runtime/
  30. samples-dev/
  31. samples/
  32. samples_2/
  33. sdk/
  34. sdk_args.gni
  35. tests/
  36. third_party/
  37. tools/
  38. utils/


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