Initial internal member mangling

compiler/testData/integration/ant/jvm/internalMembers/module2.kt

@@ -0,0 +1,29 @@
+package hello
+
+open class B : A() {
+
+    internal val z: String = "B_O"
+
+    internal fun test() = "B_K"
+
+}
+
+class C : A() {
+
+    public val z: String = "C_O"
+
+    public fun test() = "C_K"
+
+}
+
+
+public fun invokeOnB(b: B) = b.z + b.test()
+
+public fun invokeOnC(c: C) = c.z + c.test()
+
+fun main(args: Array<String>) {
+    val b = B()
+    println(invokeOnA(b))
+    println(invokeOnB(b))
+    println(invokeOnC(C()))
+}