[runtime] support new Proxy() instead of Proxy.create and install getPrototypeOf trap

test/mjsunit/readonly.js

Index: test/mjsunit/readonly.js
diff --git a/test/mjsunit/readonly.js b/test/mjsunit/readonly.js
index 084e9ffe23d54264314b63ad1dab84270341803a..8d014dcdc96fff26dea31cae624170415e306b2e 100644
--- a/test/mjsunit/readonly.js
+++ b/test/mjsunit/readonly.js
@@ -125,7 +125,7 @@ var global = this;
 
 function ReadonlyByProxy(o, name) {
   if (!global.Proxy) return ReadonlyByFreeze(o, name);  // Dummy.
-  var p = global.Proxy.create({
+  var p = new global.Proxy({}, {
     getPropertyDescriptor: function() {
       return {value: -46, writable: false, configurable: true};
     }