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Wes McKinney authored and GitHub committed 88b42ef66fe
ARROW-16757: [C++][FOLLOWUP] Fix mingw32 RTools 4.0 build by removing usage of alignas (#13557) Using `alignas(64)` (instead of `alignas(8)`) seemed to break this build. Authored-by: Wes McKinney <wesm@apache.org> Signed-off-by: Wes McKinney <wesm@apache.org>