[runtime] Fully remove RUNTIME_ASSERT for good.

test/mjsunit/es6/reflect-define-property.js

 // Copyright 2012-2015 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 423 matching lines @@
 
 // Make sure an error is thrown when trying to access to redefined function.
 try {
   obj4.bar();
   assertTrue(false);
 } catch (e) {
   assertTrue(/is not a function/.test(e));
 }
 
 
-// Test runtime calls to DefineAccessorPropertyUnchecked - make sure we don't
-// crash.
-try {
-  %DefineAccessorPropertyUnchecked(0, 0, 0, 0, 0);
-} catch (e) {
-  assertTrue(/illegal access/.test(e));
-}
-
-try {
-  %DefineAccessorPropertyUnchecked(null, null, null, null, null);
-} catch (e) {
-  assertTrue(/illegal access/.test(e));
-}
-
-// Defining properties null should fail even when we have
-// other allowed values
-try {
-  %DefineAccessorPropertyUnchecked(null, 'foo', func, null, 0);
-} catch (e) {
-  assertTrue(/illegal access/.test(e));
-}
-
 // Test that all possible differences in step 6 in DefineOwnProperty are
 // exercised, i.e., any difference in the given property descriptor and the
 // existing properties should not return true, but throw an error if the
 // existing configurable property is false.
 
 var obj5 = {};
 // Enumerable will default to false.
 assertTrue(Reflect.defineProperty(obj5, 'foo', accessorNoConfigurable));
 desc = Object.getOwnPropertyDescriptor(obj5, 'foo');
 // First, test that we are actually allowed to set the accessor if all
@@ skipping 605 matching lines @@
 Assign(new C);
 
 // Test that changes to the prototype of a simple constructor are not ignored,
 // even after creating initial instances.
 function C() {
   this.x = 23;
 }
 assertEquals(23, new C().x);
 C.prototype.__defineSetter__('x', function(value) { this.y = 23; });
 assertEquals(void 0, new C().x);