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Moving these into the middle-end pipeline will allow for additional optimization of the expansion result, such as CSE of redundant loads (c.f. https://godbolt.org/z/bEna4Md9r). For now, we conservatively place the passes at the end of the middle-end pipeline, so we mostly don't benefit from additional optimizations yet. The pipeline position will be moved in a future change. This builds on work done by legrosbuffle in https://reviews.llvm.org/D60318. --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>