[clang] [llvm] [Support] Add SipHash-based 16/64-bit ptrauth stable hash. (PR #93902)

[Daniil Kovalev via llvm-commits]

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@@ -0,0 +1,174 @@
+//===--- StableHash.cpp - An ABI-stable string hash -----------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file implements an ABI-stable string hash based on SipHash, used to
+//  compute ptrauth discriminators.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/SipHash.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Debug.h"
+#include <cstdint>
+#include <cstring>
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kovdan01 wrote:

Is `cstring` include needed? I do not see anything used from that.

https://github.com/llvm/llvm-project/pull/93902