Fix for PRPR17934; based on a fix suggested by Peter Sommerlad

llvm-svn: 196058
diff --git a/libcxx/test/iterators/iterator.range/begin-end.pass.cpp b/libcxx/test/iterators/iterator.range/begin-end.pass.cpp
index e8a6c18..65d1a7b 100644
--- a/libcxx/test/iterators/iterator.range/begin-end.pass.cpp
+++ b/libcxx/test/iterators/iterator.range/begin-end.pass.cpp
@@ -52,6 +52,7 @@
     assert ( std::end(c)     == c.end());
 #if _LIBCPP_STD_VER > 11
 //  initializer_list doesn't have cbegin/cend/rbegin/rend
+//	but std::cbegin(),etc work (b/c they're general fn templates)
 //     assert ( std::cbegin(c)  == c.cbegin());
 //     assert ( std::cbegin(c)  != c.cend());
 //     assert ( std::cend(c)    == c.cend());