[NI] Fix smartcasts computation for dot-qualifier expressions

compiler/testData/diagnostics/tests/smartCasts/castchecks/smartCastOfNullableExpressionWithExpectedType.kt

@@ -0,0 +1,9 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+class Item(val link: String?)
+
+fun test(item: Item) {
+    if (item.link != null) {
+        val href: String = <!DEBUG_INFO_SMARTCAST!>item.link<!>
+    }
+}

compiler/testData/diagnostics/tests/smartCasts/castchecks/smartCastOfNullableExpressionWithExpectedType.txt

@@ -0,0 +1,11 @@
+package
+
+public fun test(/*0*/ item: Item): kotlin.Unit
+
+public final class Item {
+    public constructor Item(/*0*/ link: kotlin.String?)
+    public final val link: kotlin.String?
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}