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

compiler/testData/codegen/box/casts/kt53677.kt

@@ -0,0 +1,29 @@
+// WITH_STDLIB
+// WITH_COROUTINES
+// DONT_TARGET_EXACT_BACKEND: JVM
+// DONT_TARGET_EXACT_BACKEND: JS
+
+import kotlin.coroutines.*
+
+public inline fun <reified T> myEmptyArray(): Array<T> = arrayOfNulls<T>(0) as Array<T>
+
+inline fun <reified T> Array<out T>?.myOrEmpty(): Array<out T> = this ?: myEmptyArray<T>()
+
+fun <T> runBlocking(c: suspend () -> T): T {
+    var res: T? = null
+    c.startCoroutine(Continuation(EmptyCoroutineContext) {
+        res = it.getOrThrow()
+    })
+    return res!!
+}
+
+suspend fun suspendHere(x: String) {}
+
+suspend fun main() {
+    arrayOf("1").myOrEmpty().forEach { suspendHere(it) }
+}
+
+fun box(): String {
+    runBlocking(::main)
+    return "OK"
+}