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

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``````````bash
git-clang-format --diff 8578b60758e6a588ec41a9678829cebec471f8e5 8e9ab9cfe45e6c958046d5a9575aedfc4cb29c0c -- llvm/include/llvm/Support/SipHash.h llvm/lib/Support/SipHash.cpp llvm/unittests/Support/SipHashTest.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/unittests/Support/SipHashTest.cpp b/llvm/unittests/Support/SipHashTest.cpp
index 1a8143d9c9..77e60109df 100644
--- a/llvm/unittests/Support/SipHashTest.cpp
+++ b/llvm/unittests/Support/SipHashTest.cpp
@@ -7,8 +7,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/SipHash.h"
-#include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringRef.h"
 #include "llvm/Support/raw_ostream.h"
 #include "gtest/gtest.h"
 
@@ -33,10 +33,10 @@ TEST(SipHashTest, PointerAuthSipHash) {
   EXPECT_EQ(0xC310U, getPointerAuthStableSipHash16("method_list_t"));
 
   // Test the limits that apply to 16 bit results but don't to 64 bit results.
-  EXPECT_EQ(1U,                  getPointerAuthStableSipHash16("_Zptrkvttf"));
+  EXPECT_EQ(1U, getPointerAuthStableSipHash16("_Zptrkvttf"));
   EXPECT_EQ(0x314FD87E0611F020U, getPointerAuthStableSipHash64("_Zptrkvttf"));
 
-  EXPECT_EQ(0xFFFFU,             getPointerAuthStableSipHash16("_Zaflhllod"));
+  EXPECT_EQ(0xFFFFU, getPointerAuthStableSipHash16("_Zaflhllod"));
   EXPECT_EQ(0x1292F635FB3DFBF8U, getPointerAuthStableSipHash64("_Zaflhllod"));
 }
 

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