In particular,
* Provides a DDC implementation for dynamic modules, where the download
and instantiation of the module is delegated to the embedder of the
program.
* Exposes an embedding API to allow embedders to define the loading logic.
* Adds a flag to compile code as a dynamic module. This includes
generating an entrypoint trampoline and checks to validate that a
dynamic module doesn't stump over previously defined libraries.
* Adds test coverage for DDC under `pkg/dynamic_modules/test/`.
Test suite can be run by executing:
```
DART_CONFIGURATION=ReleaseX64 out/ReleaseX64/dart-sdk/bin/dart \
pkg/dynamic_modules/test/runner/main.dart -t ddc
```
Once we provide integration of test configuration results to that test
runner, we will add it as part of the test matrix.
Change-Id: I626b5fefe9a27546cc6d1630d17e812544a711c6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/379748
Reviewed-by: Nicholas Shahan <nshahan@google.com>
Commit-Queue: Sigmund Cherem <sigmund@google.com>
Sigmund Cherem
9c91f31c10