Deprecate smartcasts on local delegated properties

^KT-22517 Fixed

compiler/testData/diagnostics/tests/smartCasts/localDelegatedPropertyBefore.kt

@@ -0,0 +1,15 @@
+// !LANGUAGE: -ProhibitSmartcastsOnLocalDelegatedProperty
+
+class AlternatingDelegate {
+    var counter: Int = 0
+    operator fun getValue(thisRef: Any?, property: <!UNRESOLVED_REFERENCE!>KProperty<!><*>): Any? =
+        if (counter++ % 2 == 0) 42 else ""
+}
+
+fun failsWithClassCastException() {
+    val sometimesNotInt: Any? by AlternatingDelegate()
+
+    if (sometimesNotInt is Int) {
+        <!DEPRECATED_SMARTCAST, DEBUG_INFO_SMARTCAST!>sometimesNotInt<!>.inc()
+    }
+}