[Test] Use JDK 11 instead of JDK 9 in modern jdk tests

compiler/testData/codegen/boxModernJdk/testsWithJava11/varHandle.kt

@@ -0,0 +1,32 @@
+// !LANGUAGE: +PolymorphicSignature
+// TARGET_BACKEND: JVM
+// SKIP_JDK6
+// WITH_RUNTIME
+
+import java.lang.invoke.MethodHandles
+import kotlin.concurrent.thread
+
+fun box(): String {
+    val handle = MethodHandles.arrayElementVarHandle(ByteArray::class.java)
+    val array = ByteArray(10)
+
+    val index = 0
+
+    // Check that we don't consider non-Object return type of a signature-polymorphic method to be polymorphic.
+    handle.weakCompareAndSetPlain(array, index, 0.toByte(), 21.toByte()) as Comparable<*>
+
+    val oldValue = 42.toByte()
+    val newValue = (-74).toByte()
+
+    thread {
+        Thread.sleep(400L)
+
+        handle.setVolatile(array, index, oldValue)
+    }
+
+    while (!handle.compareAndSet(array, index, oldValue, newValue)) {
+        Thread.sleep(10L)
+    }
+
+    return if (handle.getVolatile(array, index) == newValue) "OK" else "Fail"
+}