Zhihao Yuan noted that there were a few unneeded  statements.  Eliminated the unnecessary ones, and commented the ones that are there for non-obvious reasons such as to help things limp along in C++03 language mode.

llvm-svn: 189039
diff --git a/libcxx/include/algorithm b/libcxx/include/algorithm
index 053b809..03b872a 100644
--- a/libcxx/include/algorithm
+++ b/libcxx/include/algorithm
@@ -829,7 +829,7 @@
 {
     for (; __first != __last; ++__first)
         __f(*__first);
-    return _VSTD::move(__f);
+    return _VSTD::move(__f);  // explicitly moved for (emulated) C++03
 }
 
 // find