ThrowTypeError should not be constructable, so shouldn't have a prototype.

test/mjsunit/strict-mode.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1000 matching lines @@
 function CheckFunctionPillDescriptor(func, name) {
 
   function CheckPill(pill) {
     assertEquals("function", typeof pill);
     assertInstanceof(pill, Function);
     pill.property = "value";
     assertEquals(pill.value, undefined);
     assertThrows(function() { 'use strict'; pill.property = "value"; },
                  TypeError);
     assertThrows(pill, TypeError);
-    assertEquals(pill.prototype, (function(){}).prototype);
-    var d = Object.getOwnPropertyDescriptor(pill, "prototype");
-    assertFalse(d.writable);
-    assertFalse(d.configurable);
-    assertFalse(d.enumerable);
+    assertEquals(undefined, pill.prototype);
   }
 
   // Poisoned accessors are no longer own properties
   func = Object.getPrototypeOf(func);
   var descriptor = Object.getOwnPropertyDescriptor(func, name);
   CheckPill(descriptor.get)
   CheckPill(descriptor.set);
   assertFalse(descriptor.enumerable);
   // In ES6, restricted function properties are configurable
   assertTrue(descriptor.configurable);
 }
 
 
 function CheckArgumentsPillDescriptor(func, name) {
 
   function CheckPill(pill) {
     assertEquals("function", typeof pill);
     assertInstanceof(pill, Function);
     pill.property = "value";
     assertEquals(pill.value, undefined);
     assertThrows(function() { 'use strict'; pill.property = "value"; },
                  TypeError);
     assertThrows(pill, TypeError);
-    assertEquals(pill.prototype, (function(){}).prototype);
-    var d = Object.getOwnPropertyDescriptor(pill, "prototype");
-    assertFalse(d.writable);
-    assertFalse(d.configurable);
-    assertFalse(d.enumerable);
+    assertEquals(undefined, pill.prototype);
   }
 
   var descriptor = Object.getOwnPropertyDescriptor(func, name);
   CheckPill(descriptor.get)
   CheckPill(descriptor.set);
   assertFalse(descriptor.enumerable);
   assertFalse(descriptor.configurable);
 }
 
 
@@ skipping 160 matching lines @@
     assertSame(null, test(i));
   }
 })();
 
 
 (function TestStrictModeEval() {
   "use strict";
   eval("var eval_local = 10;");
   assertThrows(function() { return eval_local; }, ReferenceError);
 })();