[memprof] Use BLAKE for FrameId

llvm/include/llvm/ProfileData/MemProf.h

@@ -7,8 +7,10 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/IR/GlobalValue.h"
 #include "llvm/ProfileData/MemProfData.inc"
+#include "llvm/Support/BLAKE3.h"
 #include "llvm/Support/Endian.h"
 #include "llvm/Support/EndianStream.h"
+#include "llvm/Support/HashBuilder.h"
 #include "llvm/Support/raw_ostream.h"
 
 #include <bitset>
@@ -312,20 +314,13 @@ struct Frame {
   // hashing from llvm ADT since we are going to persist the hash id, the hash
   // combine algorithm in ADT uses a new randomized seed each time.
   inline FrameId hash() const {
-    auto HashCombine = [](auto Value, size_t Seed) {
-      std::hash<decltype(Value)> Hasher;
-      // The constant used below is the 64 bit representation of the fractional
-      // part of the golden ratio. Used here for the randomness in their bit
-      // pattern.
-      return Hasher(Value) + 0x9e3779b97f4a7c15 + (Seed << 6) + (Seed >> 2);
-    };
-
-    size_t Result = 0;
-    Result ^= HashCombine(Function, Result);
-    Result ^= HashCombine(LineOffset, Result);
-    Result ^= HashCombine(Column, Result);
-    Result ^= HashCombine(IsInlineFrame, Result);
-    return static_cast<FrameId>(Result);
+    llvm::HashBuilder<llvm::TruncatedBLAKE3<8>, llvm::endianness::little>
+        HashBuilder;
+    HashBuilder.add(Function, LineOffset, Column, IsInlineFrame);
+    llvm::BLAKE3Result<8> Hash = HashBuilder.final();
+    FrameId Id;
+    std::memcpy(&Id, Hash.data(), sizeof(Hash));
+    return Id;
   }
 };