Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/classes/kt8011.kt

@@ -0,0 +1,21 @@
+// TODO: Enable for JS when it supports local classes.
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+
+fun testFun1(str: String): String {
+    val local = str
+
+    class Local {
+        fun foo() = str
+    }
+
+    val list = listOf(0).map { Local() }
+    return list[0].foo()
+}
+
+fun box(): String {
+    return when {
+        testFun1("test1") != "test1" -> "Fail #1"
+        else -> "OK"
+    }
+}