KT-22714 Avoid to generate unecessary checkcast

- StackValue already avoid to generate checkcast from a type or an
array to java.lang.Object. Add a new case to avoid to generate a
checkcast from an array to an array of java.lang.Object when arrays
have the same dimensions.

Fix of https://youtrack.jetbrains.com/issue/KT-22714

compiler/testData/codegen/java8/bytecodeText/checkcast/kt22714.kt

@@ -0,0 +1,16 @@
+// JVM_TARGET: 1.8
+
+fun <T> Array<T>.getLength(): Int {
+    return this.size
+}
+
+fun Any.getLength() =
+    if (this is Array<*>) size else -1
+
+fun testCheckcast1(): Int {
+    val array1: Array<String> = arrayOf("1", "2", "3")
+    val array2: Any = arrayOf("1", "2", "3")
+    return array1.getLength() + array2.getLength()
+}
+
+// 1 CHECKCAST