Add various tests for DFA testing

compiler/tests-spec/testData/diagnostics/notLinked/dfa/neg/28.kt

@@ -0,0 +1,20 @@
+// !LANGUAGE: +NewInference
+// !DIAGNOSTICS: -UNUSED_EXPRESSION -UNUSED_VARIABLE -UNUSED_VALUE
+// SKIP_TXT
+
+/*
+ * KOTLIN DIAGNOSTICS NOT LINKED SPEC TEST (NEGATIVE)
+ *
+ * SECTIONS: dfa
+ * NUMBER: 28
+ * DESCRIPTION: Raw data flow analysis test
+ * HELPERS: classes, objects, typealiases, functions, enumClasses, interfaces, sealedClasses
+ */
+
+// TESTCASE NUMBER: 1
+fun <T : List<T>> Inv<out T>.case_1() {
+    if (this is MutableList<*>) {
+        <!DEBUG_INFO_EXPRESSION_TYPE("Inv<out T> & kotlin.collections.MutableList<*>"), DEBUG_INFO_EXPRESSION_TYPE("Inv<out T>")!>this<!>
+        <!DEBUG_INFO_EXPRESSION_TYPE("Inv<out T> & kotlin.collections.MutableList<*>"), DEBUG_INFO_EXPRESSION_TYPE("Inv<out T>")!>this<!>[0] = <!TYPE_MISMATCH!><!DEBUG_INFO_EXPRESSION_TYPE("Inv<out T> & kotlin.collections.MutableList<*>"), DEBUG_INFO_EXPRESSION_TYPE("Inv<out T>")!>this<!>[1]<!>
+    }
+}