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The prefalign attribute determines the function's preferred alignment. By default, the function's preferred alignment is set in a target-specific way, but it may be overridden with this attribute. The backend logic will be added in followup patches. Part of this RFC: https://discourse.llvm.org/t/rfc-enhancing-function-alignment-attributes/88019 Reviewers: efriedma-quic, nikic, arsenm Pull Request: https://github.com/llvm/llvm-project/pull/155527