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Assume twophase.c is the performance-sensitive caller, and preserve its choice of unlikely() branch hint. Add some retrospective rationale for that choice. Back-patch to v17, for the next commit to use it. Reviewed (in earlier versions) by Michael Paquier. Discussion: https://postgr.es/m/17821-dd8c334263399284@postgresql.org Discussion: https://postgr.es/m/20250116010051.f3.nmisch@google.com