Add tests for obsolete issues

#KT-38804 Obsolete
 #KT-38801 Obsolete
 #KT-38835 Obsolete
 #KT-38737 Obsolete
 #KT-38664 Obsolete
 #KT-38549 Obsolete
 #KT-38766 Obsolete
 #KT-38714 Obsolete

compiler/testData/diagnostics/tests/smartCasts/smartCastOnLastExpressionOfLambdaAfterNothing.kt

@@ -0,0 +1,14 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+
+class Inv<T>
+
+fun <T> foo(f: () -> T): Inv<T> = TODO()
+
+fun myExit(): Nothing = TODO()
+
+fun test(x: String?): Inv<String> {
+    return foo {
+        if (x == null) myExit()
+        <!DEBUG_INFO_SMARTCAST!>x<!>
+    }
+}