[ADT] Don't include <algorithm> in iterator.h

[thakis]

Summary

As far as I can tell, nothing in iterator.h uses anything from <algorithm>.

[amccarth]

Perhaps somebody confused <utility> std::move with <algorithm> std::move.

LGTM

llvm/include/llvm/ADT/iterator.h

 //===- iterator.h - Utilities for using and defining iterators --*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_ADT_ITERATOR_H
 #define LLVM_ADT_ITERATOR_H
 
 #include "llvm/ADT/iterator_range.h"
-#include <algorithm>
 #include <cstddef>
 #include <iterator>
 #include <type_traits>
 #include <utility>
 
 namespace llvm {
 
 /// CRTP base class which implements the entire standard iterator facade