Architecture:
* The backends piece together the information of the original
definitions by undoing the name mangling.
Classes, top-level methods, and static methods have the kind and
disambiguator now.
Bug: https://github.com/dart-lang/native/issues/2888
Extension name and extension method names are now tracked properly.
Unnamed extensions are named `<unnamed>` for now. We should consider
making `name` optional in the format.
Bug: https://github.com/dart-lang/native/issues/2948
We don't have test coverage for enums. The current implementation
reports them as instances.
Bug: https://github.com/dart-lang/native/issues/2944
TEST=pkg/compiler/test/record_use/record_use_test.dart
TEST=pkg/dart2wasm/test/record_use_test.dart
TEST=pkg/vm/test/transformations/record_use_test.dart
Change-Id: I7f87fcac3d2333b150cc7ed30bce7960f8a845e3
Cq-Include-Trybots: luci.dart.try:dart2wasm-asserts-linux-chrome-try,dart2wasm-asserts-minified-linux-d8-try,dart2wasm-linux-chrome-try,dart2wasm-linux-d8-try,dart2wasm-linux-firefox-try,dart2wasm-linux-jscm-chrome-try,dart2wasm-linux-optimized-jsc-try,pkg-linux-debug-try,pkg-linux-release-arm64-try,pkg-linux-release-try,pkg-mac-release-arm64-try,pkg-mac-release-try,pkg-win-release-arm64-try,pkg-win-release-try,dart2js-canary-linux-try,dart2js-hostasserts-linux-d8-try,dart2js-linux-chrome-try,dart2js-linux-firefox-try,dart2js-mac-chrome-try,dart2js-mac-safari-try,dart2js-minified-csp-linux-chrome-try,dart2js-minified-linux-d8-try,dart2js-unit-linux-x64-release-try,dart2js-win-chrome-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/481100
Reviewed-by: Nate Biggs <natebiggs@google.com>
Daco Harkes
10cc8d95c2