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

test/mjsunit/harmony/proxies.js

Index: test/mjsunit/harmony/proxies.js
diff --git a/test/mjsunit/harmony/proxies.js b/test/mjsunit/harmony/proxies.js
index e49ea7fab8c304831523e1b926a32e83b46df296..4657920719ba51ef9fa01cb8092230d0d15362fd 100644
--- a/test/mjsunit/harmony/proxies.js
+++ b/test/mjsunit/harmony/proxies.js
@@ -35,7 +35,7 @@
 // Helper.
 
 function TestWithProxies(test, x, y, z) {
-  test(Proxy.create, x, y, z)
+  test(function(o, handler){return new Proxy(o, handler)}, x, y, z)
   test(function(h) {return Proxy.createFunction(h, function() {})}, x, y, z)
 }