Deprecate smartcasts on local delegated properties

^KT-22517 Fixed

compiler/testData/diagnostics/tests/smartCasts/localDelegatedPropertyAfter.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) {
+        <!SMARTCAST_IMPOSSIBLE!>sometimesNotInt<!>.inc()
+    }
+}

compiler/testData/diagnostics/tests/smartCasts/localDelegatedPropertyAfter.txt

@@ -0,0 +1,12 @@
+package
+
+public fun failsWithClassCastException(): kotlin.Unit
+
+public final class AlternatingDelegate {
+    public constructor AlternatingDelegate()
+    public final var counter: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final operator fun getValue(/*0*/ thisRef: kotlin.Any?, /*1*/ property: [ERROR : KProperty<*>]<out [ERROR : *]>): kotlin.Any?
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

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()
+    }
+}

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

@@ -0,0 +1,12 @@
+package
+
+public fun failsWithClassCastException(): kotlin.Unit
+
+public final class AlternatingDelegate {
+    public constructor AlternatingDelegate()
+    public final var counter: kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final operator fun getValue(/*0*/ thisRef: kotlin.Any?, /*1*/ property: [ERROR : KProperty<*>]<out [ERROR : *]>): kotlin.Any?
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}