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

sdk/lib/_internal/pub_generated/test/list_package_dirs/ignores_updated_pubspec_test.dart

+import 'package:path/path.dart' as path;
+import '../../lib/src/io.dart';
+import '../descriptor.dart' as d;
+import '../test_pub.dart';
+main() {
+  initConfig();
+  integration("uses what's in the lockfile regardless of the pubspec", () {
+    d.dir("foo", [d.libDir("foo"), d.libPubspec("foo", "1.0.0")]).create();
+    d.dir(appPath, [d.appPubspec({
+        "foo": {
+          "path": path.join(sandboxDir, "foo")
+        }
+      })]).create();
+    pubGet();
+    d.dir(appPath, [d.appPubspec({
+        "bar": "any"
+      })]).create();
+    schedulePub(args: ["list-package-dirs", "--format=json"], outputJson: {
+      "packages": {
+        "foo": path.join(sandboxDir, "foo", "lib"),
+        "myapp": canonicalize(path.join(sandboxDir, appPath, "lib"))
+      },
+      "input_files": [
+          canonicalize(path.join(sandboxDir, appPath, "pubspec.lock")),
+          canonicalize(path.join(sandboxDir, appPath, "pubspec.yaml"))]
+    });
+  });
+}