Move blackBoxFile() testData to box/ directory

Delete all test methods (and empty test classes), since they'll be
auto-generated

compiler/testData/codegen/box/functions/localFunction.kt

@@ -0,0 +1,46 @@
+fun IntRange.forEach(body : (Int) -> Unit) {
+    for(i in this) {
+        body(i)
+    }
+}
+
+fun box() : String {
+    var seed = 0
+
+    fun local(x: Int) {
+        fun deep() {
+            seed += x
+        }
+        fun deep2(x : Int) {
+            seed += x
+        }
+        fun Int.iter() {
+                seed += this
+        }
+
+        deep()
+        deep2(-x)
+        x.iter()
+        seed += x
+    }
+
+    for(i in 1..5) {
+        fun Int.iter() {
+            seed += this
+        }
+
+        local(i)
+        (-i).iter()
+    }
+
+    fun local2(y: Int) {
+        seed += y
+    }
+
+    (1..5).forEach {
+            local2(it)
+    }
+
+
+    return if(seed == 30) "OK" else seed.toString()
+}