Upload Kmake

deps/v8/test/mjsunit/maglev/regress/regress-1407959.js

@@ -0,0 +1,27 @@
+// Copyright 2023 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// Flags: --maglev --allow-natives-syntax
+
+function func() {}
+function foo(x) {
+  return x instanceof func;
+}
+
+%PrepareFunctionForOptimization(foo);
+foo();
+foo();
+%OptimizeMaglevOnNextCall(foo);
+foo();
+
+let custom_has_instance_runs = 0;
+Object.defineProperty(func, Symbol.hasInstance, {
+  value: function() {
+    custom_has_instance_runs++;
+    return true;
+  }
+});
+
+assertTrue(foo());
+assertEquals(custom_has_instance_runs, 1);