Fix optimization of property delegates of platform types

The old code didn't replace the delegate field access because it was
wrapped into a TYPE_OP IMPLICIT_NOTNULL.

 #KT-54463 Fixed

compiler/testData/codegen/box/delegatedProperty/delegateToFinalProperty/kt54463_platformType.kt

@@ -0,0 +1,22 @@
+// TARGET_BACKEND: JVM
+// FILE: A.java
+
+public class A {
+    public static A create() { return new A(); }
+}
+
+// FILE: box.kt
+
+import kotlin.reflect.KProperty
+
+class C {
+    private val valueState = A.create()
+    private val value by valueState
+
+    fun get(): String = value
+}
+
+operator fun A.getValue(thisRef: Any?, property: KProperty<*>): String = "OK"
+
+fun box(): String =
+    C().get()