Add test for jump strict-not-equal undefined on 32bit

Commit 86702c3be5 and
e2218f8b5c were submitted directly to the
5.9 and 5.6 branches. As the problem does not exist per-se in 5.11 there
is no fix required. This commit only adds the test coverage for this
issue to avoid regressing.

Change-Id: Ic5f5d56f52f3855d20755f771804025f8a93acd9
Task-number: QTBUG-66832
Reviewed-by: Erik Verbruggen <erik.verbruggen@qt.io>

tests/auto/qml/qqmlecmascript/tst_qqmlecmascript.cpp

@@ -351,6 +351,7 @@ private slots:
     void shadowedFunctionName();
     void anotherNaN();
     void callPropertyOnUndefined();
+    void jumpStrictNotEqualUndefined();
 
 private:
 //    static void propertyVarWeakRefCallback(v8::Persistent<v8::Value> object, void* parameter);
@@ -8479,6 +8480,26 @@ void tst_qqmlecmascript::callPropertyOnUndefined()
     QVERIFY(!v.isError()); // well, more importantly: this shouldn't fail on an assert.
 }
 
+void tst_qqmlecmascript::jumpStrictNotEqualUndefined()
+{
+    QJSEngine engine;
+    QJSValue v = engine.evaluate(QString::fromLatin1(
+        "var ok = 0\n"
+        "var foo = 0\n"
+        "if (foo !== void 1)\n"
+        "    ++ok;\n"
+        "else\n"
+        "    --ok;\n"
+        "if (foo === void 1)\n"
+        "    --ok;\n"
+        "else\n"
+        "    ++ok;\n"
+        "ok\n"
+    ));
+    QVERIFY(!v.isError());
+    QCOMPARE(v.toInt(), 2);
+}
+
 QTEST_MAIN(tst_qqmlecmascript)
 
 #include "tst_qqmlecmascript.moc"