Stop making the incorrect assumption that x == j[n] is legitimate

whenever x = j[n] and x == x are.  j[n] may be a proxy convertible to
typeof(x) and x == x may use a templated operator==, which wouldn't
match the proxy.


[SVN r20887]

libs/iterator

@@ -1 +1 @@
-Subproject commit bdc13043269ebc5b42a2d981382c980c974750e1
+Subproject commit 522195fd64cff2701b49cc73443618cc94480a2c