Support java 9 modules in the diagnostic tests both in sources and binaries

compiler/test-infrastructure-utils/tests/org/jetbrains/kotlin/test/TestJavacVersion.kt

@@ -0,0 +1,10 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.test
+
+enum class TestJavacVersion {
+    JAVAC_1_8, JAVAC_9
+}