KT-53465, KT-53677 Get rid of unnecessary checkcasts to array of reified type

compiler/testData/codegen/box/casts/arrayDowncatingInvariant.kt

@@ -0,0 +1,10 @@
+// TARGET_BACKEND: JVM
+
+inline fun <reified T : CharSequence> f(x: Array<Any>) = x as Array<T>
+
+fun box(): String = try {
+    f<String>(arrayOf<Any>(42))
+    "Fail"
+} catch (e: Exception) {
+    "OK"
+}