[proxies] Correctly handle proxies in Function.prototype.bind

test/mjsunit/function-bind.js

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 // Flags: --allow-natives-syntax
 
-// Tests the Function.prototype.bind (ES 15.3.4.5) method.
+// Tests the Function.prototype.bind method.
+
 
 // Simple tests.
 function foo(x, y, z) {
   return [this, arguments.length, x];
 }
 
 assertEquals(3, foo.length);
 
 var f = foo.bind(foo);
 assertEquals([foo, 3, 1], f(1, 2, 3));
@@ skipping 269 matching lines @@
   var bound = fun.bind({});
   assertEquals(proto, Object.getPrototypeOf(bound));
 
   var bound2 = fun.bind({});
   assertTrue(%HaveSameMap(new bound, new bound2));
 
   Object.setPrototypeOf(fun, null);
   bound = Function.prototype.bind.call(fun, {});
   assertEquals(null, Object.getPrototypeOf(bound));
 })();