Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/lib/src/package_graph.dart

Index: sdk/lib/_internal/pub_generated/lib/src/package_graph.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/package_graph.dart b/sdk/lib/_internal/pub_generated/lib/src/package_graph.dart
new file mode 100644
index 0000000000000000000000000000000000000000..26326c82757b95b3a754db064bec8f1a6dc6bb40
--- /dev/null
+++ b/sdk/lib/_internal/pub_generated/lib/src/package_graph.dart
@@ -0,0 +1,25 @@
+library pub.package_graph;
+import 'entrypoint.dart';
+import 'lock_file.dart';
+import 'package.dart';
+import 'utils.dart';
+class PackageGraph {
+  final Entrypoint entrypoint;
+  final LockFile lockFile;
+  final Map<String, Package> packages;
+  Map<String, Set<Package>> _transitiveDependencies;
+  PackageGraph(this.entrypoint, this.lockFile, this.packages);
+  Set<Package> transitiveDependencies(String package) {
+    if (package == entrypoint.root.name) return packages.values.toSet();
+    if (_transitiveDependencies == null) {
+      var closure = transitiveClosure(
+          mapMap(
+              packages,
+              value: (_, package) => package.dependencies.map((dep) => dep.name)));
+      _transitiveDependencies = mapMap(
+          closure,
+          value: (_, names) => names.map((name) => packages[name]).toSet());
+    }
+    return _transitiveDependencies[package];
+  }
+}