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

compiler/testData/codegen/bytecodeText/checkcast/kt53465.kt

@@ -0,0 +1,15 @@
+// TARGET_BACKEND: JVM_IR
+
+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 foo(a : Array<String>?) = a.myOrEmpty()
+
+val a = arrayOf<Int>(1) as Array<Any>
+
+val b = arrayOf<Int>(1) as Array<Int>
+
+val c = arrayOf(arrayOf<Int>(1)) as Array<Array<Any>?>
+
+// 0 CHECKCAST