[vm/aot] Improve dynamic interface annotator Dynamic interface annotator now automatically annotates classes and members which are used implicitly: * Targets of redirecting factories. * Classes and members used in constants. * Instance fields of classes used in instance constants or having a callable const constructor. * Everything used in the bodies of extendable mixin declarations and mixin classes. * Possible dispatch targets of instance calls (overrides/implementations). Front-end server now also exposes '--dynamic-interface' option, similar to gen_kernel tool. Also, this change includes a couple of minor fixes: * Typo in ast.dart. * In the front-end server, additional dill file specified with '--import-dill' option is not ignored when '--link-platform' is also used. TEST=pkg/vm/testcases/transformations/dynamic_interface_annotator Change-Id: I705b64efb1834dec6e0bdc5873025607f3472139 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/377761 Reviewed-by: Slava Egorov <vegorov@google.com> Commit-Queue: Alexander Markov <alexmarkov@google.com>
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