Data flow information is no longer dropped while analyzing object literal expression. #KT-6293 Fixed. #KT-7110 Fixed.

A set of tests for KT-6293 / KT-7110 provided.

compiler/testData/diagnostics/tests/smartCasts/objectLiterals/captured.kt

@@ -0,0 +1,22 @@
+abstract class Runnable {
+    abstract fun run()
+}
+
+fun foo(): Int {
+    val c: Int? = null
+    var a: Int?
+    if (c is Int) {
+        a = 2
+        val k = object: Runnable() {
+            init {
+                a = null
+            }
+            override fun run() = Unit
+        }
+        k.run()
+        val d: Int = <!DEBUG_INFO_SMARTCAST!>c<!>
+        // a is captured so smart cast is not possible
+        return d + <!SMARTCAST_IMPOSSIBLE!>a<!>
+    }
+    else return -1
+}