Upload Kmake

deps/v8/test/mjsunit/regress/regress-397720949.js

@@ -0,0 +1,15 @@
+// Copyright 2025 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: --js-staging
+
+const ab = new ArrayBuffer(4, { "maxByteLength": 8 });
+const f16 = new Float16Array(ab);
+const evil = {
+  valueOf() {
+      ab.resize(0);
+      return 1;
+  }
+};
+assertEquals(-1, f16.lastIndexOf(0, evil));