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

test/mjsunit/regress/regress-crbug-506956.js

Index: test/mjsunit/regress/regress-crbug-506956.js
diff --git a/test/mjsunit/regress/regress-crbug-506956.js b/test/mjsunit/regress/regress-crbug-506956.js
index 5862ddb296747f4622778a82db65ae2eda1e58c1..73eb2f2220b6dbff80ea93bf35af4d1af1699508 100644
--- a/test/mjsunit/regress/regress-crbug-506956.js
+++ b/test/mjsunit/regress/regress-crbug-506956.js
@@ -5,7 +5,9 @@
 // Flags: --harmony-proxies
 
 try {
-  var p = Proxy.create({ getPropertyDescriptor: function() { throw "boom"; } });
+  var p = new Proxy({}, {
+      getPropertyDescriptor: function() { throw "boom"; }
+  });
   var o = Object.create(p);
   with (o) { delete unresolved_name; }
 } catch(e) {