[llvm] [CodeGen,IRNormalizer,BOLT] Duplicate stable hash_16_bytes locally. NFC (PR #196854)

[Amir Ayupov via llvm-commits]

https://github.com/aaupov approved this pull request.

Thank you for catching this. LGTM for BOLT.

I expected switching from std hash to xxh3 was supposed to guarantee stability, but overlooked this part.


https://github.com/llvm/llvm-project/pull/196854