Instance method dispatch uses boxed calling conventions if receiver
has a dynamically loaded class, even if method is not exported through
dynamic interface. So we need to disable unboxing and register calling
conventions for instance methods of classes with potential
dynamically loaded subtypes (implicitly or explicitly extendable).
Bug: b/454825012
TEST=pkg/dynamic_modules/test/data/extend_class4
Change-Id: I8256d72fa6fab82cdbe6f018094cbe20f429c220
Cq-Include-Trybots: luci.dart.try:vm-aot-dyn-linux-debug-x64-try,vm-aot-dyn-linux-product-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/457441
Reviewed-by: Slava Egorov <vegorov@google.com>
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Alexander Markov