[lld-macho,BalancedPartition] Simplify relocation hash and avoid xxHash xxHash, inferior to xxh3, is discouraged. We try not to use xxhash in lld. Switch to read32le for content hash and xxh3/stable_hash_combine for relocation hash. Remove the intermediate std::string for relocation hash. Change the tail hashing scheme to consider individual bytes instead. This helps group 0102 and 0201 together. The benefit is negligible, though. Pull Request: https://github.com/llvm/llvm-project/pull/121729
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