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

test/mjsunit/es6/iteration-semantics.js

Index: test/mjsunit/es6/iteration-semantics.js
diff --git a/test/mjsunit/es6/iteration-semantics.js b/test/mjsunit/es6/iteration-semantics.js
index f29e6e011b5a71deaf00b148dbcd5a53c3f5e426..43075a4033f9dc2d9f7691437328a39b52d6dcd8 100644
--- a/test/mjsunit/es6/iteration-semantics.js
+++ b/test/mjsunit/es6/iteration-semantics.js
@@ -309,7 +309,7 @@ assertEquals(5,
 
 // Proxy results, with getters.
 function transparent_proxy(x) {
-  return Proxy.create({
+  return new Proxy({}, {
     get: function(receiver, name) { return x[name]; }
   });
 }
@@ -324,7 +324,7 @@ assertEquals([1, 2],
 // Proxy iterators.
 function poison_proxy_after(iterable, n) {
   var iterator = iterable[Symbol.iterator]();
-  return wrap_iterator(Proxy.create({
+  return wrap_iterator(new Proxy({}, {
     get: function(receiver, name) {
       if (name == 'next' && n-- < 0) throw "unreachable";
       return iterator[name];