Move some tests from boxWithStdlib/ to box/

Move those tests which do not require neither stdlib nor reflect

compiler/testData/codegen/boxWithStdlib/when/exhaustiveBreakContinue.kt

@@ -1,14 +0,0 @@
-enum class Color { RED, GREEN, BLUE }
-
-fun foo(arr: Array<Color>): Color {
-    loop@ for (color in arr) {
-        when (color) {
-            Color.RED -> return color
-            Color.GREEN -> break@loop
-            Color.BLUE -> if (arr.size == 1) return color else continue@loop
-        }
-    }
-    return Color.GREEN
-}
-
-fun box() = if (foo(arrayOf(Color.BLUE, Color.GREEN)) == Color.GREEN) "OK" else "FAIL"