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(parent: 98f320e) | patch

Teach fasthash_accum to use platform endianness for bytewise loads

Teach fasthash_accum to use platform endianness for bytewise loads

This function previously used a mix of word-wise loads and bytewise
loads. The bytewise loads happened to be little-endian regardless of
platform. This in itself is not a problem. However, a future commit
will require the same result whether A) the input is loaded as a
word with the relevent bytes masked-off, or B) the input is loaded
one byte at a time.

While at it, improve debuggability of the internal hash state.

Discussion: https://postgr.es/m/CANWCAZZpuV1mES1mtSpAq8tWJewbrv4gEz6R_k4gzNG8GZ5gag%40mail.gmail.com

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