Add SdkPatcher and implement top-level function / getter / setter patching.

pkg/analyzer/test/src/dart/sdk/test_all.dart

Index: pkg/analyzer/test/src/dart/sdk/test_all.dart
diff --git a/pkg/analyzer/test/src/dart/sdk/test_all.dart b/pkg/analyzer/test/src/dart/sdk/test_all.dart
index a86278b24ca1f155d4a5d2250bfc4b2154d0ed91..cb044fd713a8e045567b03ebafccf1e74b31fa4c 100644
--- a/pkg/analyzer/test/src/dart/sdk/test_all.dart
+++ b/pkg/analyzer/test/src/dart/sdk/test_all.dart
@@ -6,11 +6,13 @@ library analyzer.test.src.dart.sdk.test_all;
 
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
+import 'patch_test.dart' as patch_test;
 import 'sdk_test.dart' as sdk;
 
 /// Utility for manually running all tests.
 main() {
   defineReflectiveSuite(() {
+    patch_test.main();
     sdk.main();
   }, name: 'sdk');
 }