Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/anonymousObject/constructorVisibility.kt

@@ -0,0 +1,23 @@
+// FILE: 1.kt
+
+package test
+
+interface Run {
+    fun run(): String
+}
+
+internal class A {
+    inline fun doSomething(): Run  {
+        return object : Run {
+            override fun run(): String =  "OK"
+        }
+    }
+}
+
+// FILE: 2.kt
+
+import test.*
+
+fun box(): String {
+    return A().doSomething().run()
+}