[Serialization] Use specialized decl hash function for GlobalDeclID (#95730) See the comment: https://github.com/llvm/llvm-project/pull/92083#issuecomment-2168121729 After the patch, https://github.com/llvm/llvm-project/pull/92083, the lower 32 bits of DeclID can be the same commonly. This may produce many collisions. It will be best to change the default hash implementation for uint64_t. But sent this one as a quick workaround. Feel free to update this if you prefer other hash functions.
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