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f4f55d5124
This avoids a compiler bug occurring in AIX's xlc, even in pretty late-model revisions. Buildfarm testing has now confirmed that only 64-bit xlc is affected. Although we are contemplating dropping support for xlc in v17, it's still supported in the back branches, so we need this fix. Back-patch of code changes from HEAD commit 19fa97731. (The test cases were already back-patched, in 4a427b82c et al.) Discussion: https://postgr.es/m/CA+hUKGK=DOC+hE-62FKfZy=Ybt5uLkrg3zCZD-jFykM-iPn8yw@mail.gmail.com