Revert "[Support] Don't include <algorithm> in Hashing.h"

This reverts commit ef620c40f371e7e3269bd8bef57d069330baa355.

- `std::rotate` still needs <alogirthm>

GitOrigin-RevId: 853da5977e74e6d4412397db341f6c4e8cadb895
diff --git a/include/llvm/ADT/Hashing.h b/include/llvm/ADT/Hashing.h
index d29d1a4..e296c1c 100644
--- a/include/llvm/ADT/Hashing.h
+++ b/include/llvm/ADT/Hashing.h
@@ -48,6 +48,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/SwapByteOrder.h"
 #include "llvm/Support/type_traits.h"
+#include <algorithm>
 #include <cassert>
 #include <cstring>
 #include <string>