[BOLT] Use deterministic xxh3 for computing BF/BB hashes (#72542)

std::hash and ADT/Hashing::hash_value are non-deterministic functions
whose
results might vary across implementation/process/execution. Using xxh3
instead
for computing hashes of BinaryFunctions and BinaryBasicBlock for stale
profile
matching.
(A possible alternative is to use ADT/StableHashing.h based on FNV
hashing but
xxh3 seems to be more popular in LLVM)

This is to address https://github.com/llvm/llvm-project/issues/65241.