Move some tests from boxWithStdlib/ to box/

Move those tests which do not require neither stdlib nor reflect

compiler/testData/codegen/box/arrays/kt3771.kt

@@ -0,0 +1,14 @@
+fun fill(dest : Array<in String>, v : String) {
+    dest[0] = v
+}
+
+fun box() : String {
+//fun main(args : Array<String>) {
+    val s : String = "bar"
+    val any : Array<Any> = arrayOf(1, "foo", 1.234)
+    fill(any, s)
+    /* shouldn't throw
+ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.String;
+     */
+    return "OK"
+}