Reland "[cfe] Compile null-aware spreads in non-const maps"

This is a reland of 3160b084d8032f313c4b6e6f681092eb5ba66973

Original change's description:
> [cfe] Compile null-aware spreads in non-const maps
> 
> Change-Id: I22ee0b8821835bf8f2417f5fb4433898d06e7c36
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/96060
> Reviewed-by: Kevin Millikin <kmillikin@google.com>

Change-Id: I46198eb380a1813723376e894d5d32261b25dfcb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/96132
Reviewed-by: Régis Crelier <regis@google.com>
5 files changed
tree: 6de78565af460ec8aedae0cb89359a366f5f859b
  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

Dart

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Using Dart

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