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

sdk/lib/_internal/pub_generated/test/get/git/check_out_twice_test.dart

Index: sdk/lib/_internal/pub_generated/test/get/git/check_out_twice_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/get/git/check_out_twice_test.dart b/sdk/lib/_internal/pub_generated/test/get/git/check_out_twice_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..f2fc87e99b170c29035bf50bb460fa9252bb9352
--- /dev/null
+++ b/sdk/lib/_internal/pub_generated/test/get/git/check_out_twice_test.dart
@@ -0,0 +1,28 @@
+library pub_tests;
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+main() {
+  initConfig();
+  integration('checks out a package from Git twice', () {
+    ensureGit();
+    d.git('foo.git', [d.libDir('foo'), d.libPubspec('foo', '1.0.0')]).create();
+    d.appDir({
+      "foo": {
+        "git": "../foo.git"
+      }
+    }).create();
+    pubGet();
+    d.dir(
+        cachePath,
+        [
+            d.dir(
+                'git',
+                [
+                    d.dir('cache', [d.gitPackageRepoCacheDir('foo')]),
+                    d.gitPackageRevisionCacheDir('foo')])]).validate();
+    d.dir(
+        packagesPath,
+        [d.dir('foo', [d.file('foo.dart', 'main() => "foo";')])]).validate();
+    pubUpgrade();
+  });
+}