Initial internal member mangling

compiler/testData/codegen/box/mangling/internalOverrideSuperCall.kt

@@ -0,0 +1,21 @@
+open class A {
+    internal open val field = "F"
+
+    internal open fun test(): String = "A"
+}
+
+class Z : A() {
+    override fun test(): String = super.test()
+
+    override val field = super.field
+}
+
+fun box() : String {
+    val z = Z().test()
+    if (z != "A") return "fail 1: $z"
+
+    val f = Z().field
+    if (f != "F") return "fail 2: $f"
+
+    return "OK"
+}