Upload Kmake

deps/v8/test/mjsunit/regress/wasm/regress-399402814.js

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+// 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: --allow-natives-syntax
+
+let empty_module = new Uint8Array([0, 97, 115, 109, 1, 0, 0, 0]);
+let module = new WebAssembly.Module(empty_module);
+let instance = new WebAssembly.Instance(module, {});
+
+// We don't care what this returns as long as it doesn't crash.
+%BuildRefTypeBitfield(123, instance);
+// Issue 399769594 pointed out that we need even more robustness:
+%BuildRefTypeBitfield(-1, instance);