[IR] Add test for internal fake overrides from friend module

compiler/testData/codegen/box/fakeOverride/internalFromFriendModule.kt

@@ -0,0 +1,19 @@
+
+// MODULE: lib
+// FILE: l.kt
+
+open class Base {
+    internal fun o() = "O"
+}
+
+open internal class In {
+    fun k() = "K"
+}
+
+// MODULE: main(lib)(lib)
+// FILE: m.kt
+
+class Derived: Base()
+internal class IDerived: In()
+
+fun box(): String = Derived().o() + IDerived().k()