Use HASH_BLOBS for xidhash.

Noah Misch <noah@leadboat.com>

Commit: a1b8aa1e4eec520ed8f11c3d134a7a866358d39a
Author: Noah Misch <noah@leadboat.com>
Date: 2020-12-13T05:38:36Z
Releases: 14.0
Use HASH_BLOBS for xidhash.

This caused BufFile errors on buildfarm member sungazer, and SIGSEGV was
possible.  Conditions for reaching those symptoms were more frequent on
big-endian systems.

Discussion: https://postgr.es/m/20201129214441.GA691200@rfd.leadboat.com

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