[vm/compiler] Do not generate unnecessary field length guards

GuardFieldLengthInstr::EmitNativeCode aborts background compilation
if we're not tracking list length for a field
(guarded_list_length() == Field::kNoFixedLength).
I'm seeing a lot of aborted background compilations on a Flutter app with
the reason "GuardFieldLengthInstr: field state changed while compiling".

This CL avoids generating these useless (and harmful) GuardFieldLengthInstr
if not tracking list length for a field.

Change-Id: I2a083c5df35e89893c9e787bebe4e3e7d8177c83
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/99737
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Aart Bik <ajcbik@google.com>
1 file changed
tree: 221c8006eca18e3f9e1e0cfc653907c3c40c8fdc
  1. .clang-format
  2. .gitattributes
  3. .gitconfig
  4. .github/
  5. .gitignore
  6. .gn
  7. .mailmap
  8. .packages
  9. .vpython
  10. AUTHORS
  11. BUILD.gn
  12. CHANGELOG.md
  13. CONTRIBUTING.md
  14. DEPS
  15. LICENSE
  16. PATENTS
  17. PRESUBMIT.py
  18. README.dart-sdk
  19. README.md
  20. WATCHLISTS
  21. build/
  22. client/
  23. codereview.settings
  24. docs/
  25. pkg/
  26. runtime/
  27. samples-dev/
  28. samples/
  29. sdk/
  30. tests/
  31. third_party/
  32. tools/
  33. utils/
README.md

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