Migrate boxInline tests to new multi-file framework

compiler/testData/codegen/boxInline/anonymousObject/kt9591.kt

@@ -0,0 +1,28 @@
+// FILE: 1.kt
+
+package test
+
+
+
+inline fun inlineFun(p: () -> Unit) {
+    p()
+}
+
+// FILE: 2.kt
+
+import test.*
+
+public fun box(): String {
+    var z = "fail"
+    inlineFun {
+        val obj = object  {
+            val _delegate by lazy {
+                z = "OK"
+            }
+        }
+
+        obj._delegate
+    }
+
+    return z;
+}