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There is little point in using the LWLockRegisterTranche mechanism for built-in tranche names. It wastes cycles, it creates opportunities for bugs (since failing to register a tranche name is a very hard-to-detect problem), and the lack of any centralized list of names encourages sloppy nonconformity in name choices. Moreover, since we have a centralized list of the tranches anyway in enum BuiltinTrancheIds, we're certainly not buying any flexibility in return for these disadvantages. Hence, nuke all the backend-internal LWLockRegisterTranche calls, and instead provide a const array of the builtin tranche names. (I have in mind to change a bunch of these names shortly, but this patch is just about getting them into one place.) Discussion: https://postgr.es/m/9056.1589419765@sss.pgh.pa.us