[K/N][Tests] Adjust moved codegen tests to new infra

^KT-61259

native/native.tests/testData/codegen/escapeAnalysis/test12.kt

@@ -2,8 +2,7 @@
  * Copyright 2010-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
  * that can be found in the LICENSE file.
  */
-
-package codegen.escapeAnalysis.test12
+// TODO: check mentioned debug output of escape analyser
 
 class A(val s: String)
 
@@ -17,4 +16,4 @@ class A(val s: String)
 // Escapes:
 fun foo(arr: Array<A>) = arr[0]
 
-fun main() = println(foo(arrayOf(A("zzz"))).s)
+fun box(): String = foo(arrayOf(A("OK"))).s