[Tests] Migrate backend-independent tests from native to compiler/testData.

^KT-65979

compiler/testData/codegen/box/innerClass/inheritanceMultipleModules2.kt

@@ -0,0 +1,16 @@
+// MODULE: lib
+// FILE: lib.kt
+
+open class Outer(val x: String) {
+    open inner class Inner1
+    inner class Middle(x: String) : Outer(x) {
+        inner class Inner2 : Inner1() {
+            fun foo() = this@Outer.x + this@Middle.x
+        }
+    }
+}
+
+// MODULE: main(lib)
+// FILE: main.kt
+
+fun box() = Outer("O").Middle("K").Inner2().foo()