[dart2js] Introduce formalized phases to Dart2JS. This change locks down the Dart2JS command line API to the few invocation flows we use today: 1) Full compile from Dart sources. 2) Full compile from pre-compiled dill sources (modular CFE). 3) Phased compilation from Dart sources. 4) Phased compilation from pre-compiled dill sources (modular CFE). It also ensures that each phase is run individually (accounting for sharding in codegen/emitter). There are already places in the code where we assume that Dart2JS will be invoked in one of these ways so this should codify those assumptions. Change-Id: I4e2a85d123e0c2ad924e2dd1b230548a995af0da Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/299760 Reviewed-by: Sigmund Cherem <sigmund@google.com> Reviewed-by: Mayank Patke <fishythefish@google.com>
Dart is:
Optimized for UI: Develop with a programming language specialized around the needs of user interface creation.
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