Move blackBoxFile() testData to box/ directory

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

compiler/testData/codegen/box/arrays/kt503.kt

@@ -0,0 +1,32 @@
+fun iarr(vararg a : Int) = a
+fun <T> array(vararg a : T) = a
+
+fun box() : String {
+    val tests = array<IntArray>(
+        iarr(6, 5, 4, 3, 2, 1),
+        iarr(1, 2),
+        iarr(1, 2, 3),
+        iarr(1, 2, 3, 4),
+        iarr(1)
+    )
+
+    var n = 0
+
+    try {
+        var i = 0
+        while (true) {
+            if (thirdElementIsThree(tests[i++]))
+              n++
+        }
+    }
+    catch (e : ArrayIndexOutOfBoundsException) {
+        // No more tests to process
+    }
+    System.out?.println(n)
+    return if(n == 2) "OK" else "fail"
+}
+
+fun thirdElementIsThree(a : IntArray) =
+// Problematic code does not compile
+//    a.size >= 3 & a[2] == 3
+    a.size >= 3 && a[2] == 3