Move blackBoxFile() testData to box/ directory

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

compiler/testData/codegen/box/classes/kt501.kt

@@ -0,0 +1,24 @@
+class Reluctant() {
+     {
+        throw Exception("I'm not coming out")
+     }
+}
+
+fun p(o : Any?) = System.out?.println(o)
+
+fun test1() : String {
+  try {
+      val b = Reluctant()
+      return "Surprise!"
+  }
+  catch (ex : Exception) {
+      return "I told you so"
+  }
+}
+
+
+fun box() : String {
+    if(test1() != "I told you so") return "test1 failed"
+
+    return "OK"
+}