Add annex-b tests

Author: slowcheetah

tests/type-definitions/global/annex-b/object-proto.test.ts

@@ -1,3 +1,4 @@
 import 'core-js/full';
 
-const objectProto: object | null = {}.__proto__;
+declare const obj: Object;
+const objectProto: object | null = obj.__proto__;

tests/type-definitions/global/annex-b/object-prototype-accessor-methods.test.ts

@@ -0,0 +1,7 @@
+import 'core-js/full';
+
+declare const obj: Object;
+obj.__defineGetter__('num', () => 42);
+obj.__defineSetter__('num', (val: number) => {});
+const getter: (() => any) | undefined = obj.__lookupGetter__('num');
+const setter: ((val: number) => any) | undefined = obj.__lookupSetter__('num');