[NI] Continue resolution after unstable smart cast on receiver

The old inference cosideres candidates with unstable smartcast on
receiver unsuccessful, therefore another one may be selected.
KT-36264

compiler/testData/diagnostics/tests/resolve/noStopOnReceiverUnstableSmartCast.kt

@@ -0,0 +1,27 @@
+interface Base {
+    val parent: Base
+}
+
+class Derived : Base {
+    override val parent: Base
+        get() = TODO()
+}
+
+fun test(d: Derived) {
+    when {
+        d.parent is Derived -> d.parent.parent
+    }
+}
+
+fun Any?.take() {}
+class Something {
+    var prop: String? = null
+
+    fun String.take() {}
+
+    fun test() {
+        if (prop is String) {
+            prop.take()
+        }
+    }
+}