UntaggedClass::host_type_arguments_field_offset_in_words_ is initialized
when class is finalized. When comparing generic types for the class
which was not finalized, we cannot rely on the value of that field.
Intrinsified Type.operator== has been using host_type_arguments_field_offset_in_words_
to check if the class is generic, and has been treating classes which
are not finalized as non-generic. This has been causing the wrong
result for generic types which are different only in type arguments.
This change fixes Type.operator== intrinsics to check if
type arguments match even if class was not finalized.
Also, EquivalentClassIds helper was revised to take 3 labels
explicitly for all possible outcomes (instead of 2 labels and
a fall-through).
TEST=runtime/tests/vm/dart/regress_47425_test.dart
Fixes https://github.com/dart-lang/sdk/issues/47425
Change-Id: I3f49114644d44808c668df7cbb8a702cd42b3673
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/216270
Reviewed-by: Tess Strickland <sstrickl@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Alexander Markov
4b04219d94