Added idea for a simple C++ checker.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42834 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/TODO.txt b/TODO.txt
index 17fba95..3ef1461 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -28,4 +28,6 @@
 
 //===---------------------------------------------------------------------===//
 
-
+C++ (checker): For iterators, warn of the use of "iterator++" instead
+  of "++iterator" when when the value returned by operator++(int) is
+  ignored.