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

sdk/lib/_internal/pub_generated/test/cache/add/all_with_some_versions_present_test.dart

+library pub_tests;
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+main() {
+  initConfig();
+  integration('"--all" adds all non-installed versions of the package', () {
+    servePackages((builder) {
+      builder.serve("foo", "1.2.1");
+      builder.serve("foo", "1.2.2");
+      builder.serve("foo", "1.2.3");
+      builder.serve("foo", "2.0.0");
+    });
+    schedulePub(
+        args: ["cache", "add", "foo", "-v", "1.2.1"],
+        output: 'Downloading foo 1.2.1...');
+    schedulePub(
+        args: ["cache", "add", "foo", "-v", "1.2.3"],
+        output: 'Downloading foo 1.2.3...');
+    schedulePub(args: ["cache", "add", "foo", "--all"], output: '''
+          Already cached foo 1.2.1.
+          Downloading foo 1.2.2...
+          Already cached foo 1.2.3.
+          Downloading foo 2.0.0...''');
+    d.cacheDir({
+      "foo": "1.2.1"
+    }).validate();
+    d.cacheDir({
+      "foo": "1.2.2"
+    }).validate();
+    d.cacheDir({
+      "foo": "1.2.3"
+    }).validate();
+    d.cacheDir({
+      "foo": "2.0.0"
+    }).validate();
+  });
+}