Migrate boxInline tests to new multi-file framework

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

@@ -0,0 +1,19 @@
+// FILE: 1.kt
+
+package test
+
+internal class A {
+    inline fun doSomething(): String  {
+        return {
+            "OK"
+        }()
+    }
+}
+
+// FILE: 2.kt
+
+import test.*
+
+fun box(): String {
+    return A().doSomething()
+}