[vm/compiler] Remove too conservative release assert, add boxed-field/unboxed-implicit-getter graph intrinsic support

The initial release assert was added when removing assembler intrinsics
for implicit getters and replacing them with graph intrinsics in:


Normally if the return value of a implicit field getter is unboxed, the
field itself must be unboxable. That is true, though just because we can
unbox a field doesn't mean we always will:

The unboxing field bitmap - which e.g. the GC uses - only allows 64-bits.
Classes with more fields might have some fields boxed even though they
could theoretically be unboxed.

Closes https://github.com/flutter/flutter/issues/67803

Change-Id: I39717d356e293ed85becd64c8a664465d2abd31d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/168100
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
7 files changed
tree: a527d701a26de216058b2935463121bd51ac284b
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. client/
  6. docs/
  7. pkg/
  8. runtime/
  9. samples/
  10. samples-dev/
  11. sdk/
  12. tests/
  13. third_party/
  14. tools/
  15. utils/
  16. .clang-format
  17. .gitattributes
  18. .gitconfig
  19. .gitignore
  20. .gn
  21. .mailmap
  22. .packages
  23. .style.yapf
  24. .vpython
  26. BUILD.gn
  27. CHANGELOG.md
  28. codereview.settings
  30. DEPS
  33. PRESUBMIT.py
  34. README.dart-sdk
  35. README.md
  36. sdk_args.gni


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