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

sdk/lib/_internal/pub_generated/test/upgrade/git/upgrade_locked_test.dart

+library pub_tests;
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+main() {
+  initConfig();
+  integration("upgrades locked Git packages", () {
+    ensureGit();
+    d.git('foo.git', [d.libDir('foo'), d.libPubspec('foo', '1.0.0')]).create();
+    d.git('bar.git', [d.libDir('bar'), d.libPubspec('bar', '1.0.0')]).create();
+    d.appDir({
+      "foo": {
+        "git": "../foo.git"
+      },
+      "bar": {
+        "git": "../bar.git"
+      }
+    }).create();
+    pubGet();
+    d.dir(
+        packagesPath,
+        [
+            d.dir('foo', [d.file('foo.dart', 'main() => "foo";')]),
+            d.dir('bar', [d.file('bar.dart', 'main() => "bar";')])]).validate();
+    d.git(
+        'foo.git',
+        [d.libDir('foo', 'foo 2'), d.libPubspec('foo', '1.0.0')]).commit();
+    d.git(
+        'bar.git',
+        [d.libDir('bar', 'bar 2'), d.libPubspec('bar', '1.0.0')]).commit();
+    pubUpgrade();
+    d.dir(
+        packagesPath,
+        [
+            d.dir('foo', [d.file('foo.dart', 'main() => "foo 2";')]),
+            d.dir('bar', [d.file('bar.dart', 'main() => "bar 2";')])]).validate();
+  });
+}