Move blackBoxFile() testData to box/ directory

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

compiler/testData/codegen/box/when/range.kt

@@ -0,0 +1,29 @@
+fun isDigit(a: Int) : String {
+    val aa = java.util.ArrayList<Int> ()
+    aa.add(239)
+
+    return when(a) {
+      in aa -> "array list"
+      in 0..9 -> "digit"
+     !in 0..100 -> "not small"
+      else -> "something"
+    }
+}
+
+fun assertDigit(i: Int, expected: String): String {
+  val result = isDigit(i)
+  return if (result == expected) "" else "fail: isDigit($i) = \"$result\""
+}
+
+fun box(): String {
+  val result =
+  assertDigit(239, "array list") +
+  assertDigit(0, "digit") +
+  assertDigit(9, "digit") +
+  assertDigit(5, "digit") +
+  assertDigit(19, "something") +
+  assertDigit(190, "not small")
+
+  if (result == "") return "OK"
+  return result
+}