[ADT] Simplify hash_combine (NFC) (#159938) We just started using a C++17 fold expression inside combine (#159901). We still carry the style that was suitable for recursive calls of combine_data. Specifically, we keep passing several state variables as parameters of combine_data. Now that we no longer use recursion, this patch simplifies hash_combine_recursive_helper by making buffer_ptr, buffer_end, and length member variables while dropping the return value from hash_combine. This patch also names hash_combine_recursive_helper to hash_combine_helper. I will follow up to update comments that still mention "recursion".
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