Fix null.runtimeType, reflect(null).type.superinterfaces, and reflect(null).getField.

sdk/lib/_internal/lib/js_mirrors.dart

Index: sdk/lib/_internal/lib/js_mirrors.dart
diff --git a/sdk/lib/_internal/lib/js_mirrors.dart b/sdk/lib/_internal/lib/js_mirrors.dart
index 6b58b6f457502afa755a0e95e3e08ac02c5545f3..0154824bf1bde1521303f615bb696e99416cc782 100644
--- a/sdk/lib/_internal/lib/js_mirrors.dart
+++ b/sdk/lib/_internal/lib/js_mirrors.dart
@@ -878,10 +878,11 @@ class JsInstanceMirror extends JsObjectMirror implements InstanceMirror {
   /// reflective information to know how to to invoke a specific member.
   get _classInvocationCache {
     String cacheName = Primitives.mirrorInvokeCacheName;
-    var cache = JS('', r'#.constructor[#]', reflectee, cacheName);
+    var cacheHolder = (reflectee == null) ? getInterceptor(null) : reflectee;
+    var cache = JS('', r'#.constructor[#]', cacheHolder, cacheName);
     if (cache == null) {
       cache = JsCache.allocate();
-      JS('void', r'#.constructor[#] = #', reflectee, cacheName, cache);
+      JS('void', r'#.constructor[#] = #', cacheHolder, cacheName, cache);
     }
     return cache;
   }
@@ -1070,7 +1071,7 @@ class JsInstanceMirror extends JsObjectMirror implements InstanceMirror {
     // interceptor between multiple different instances of [InstanceMirror].
     var interceptor = getInterceptor(object);
     if (!useEval) return _newInterceptGetterNoEvalFn(name, interceptor);
-    String className = JS('String', '#.constructor.name', object);
+    String className = JS('String', '#.constructor.name', interceptor);
     var body = "(function $className\$$name(o){return i.$name(o)})";
     return JS('', '(function(b,i){return eval(b)})(#,#)', body, interceptor);
   }