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

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

+library pub_tests;
+import 'package:scheduled_test/scheduled_test.dart';
+import '../../descriptor.dart' as d;
+import '../../test_pub.dart';
+main() {
+  initConfig();
+  group("(regression)", () {
+    integration('checks out a package from Git with a trailing slash', () {
+      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();
+    });
+  });
+}