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[LLVM9+] Use llvm.psub in offset_from #57818

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@scottmcm

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@scottmcm

Ref http://lists.llvm.org/pipermail/llvm-dev/2019-January/129095.html & https://reviews.llvm.org/D56598

offset_from tracking issue: #41079

Previous discussion about offset_from wanting a different subtraction mode than existed in LLVM at the time: #41079 (comment)

(Hmm, Ralf was CC'd on the llvm-dev mail suggesting this, so I bet this is exactly what we need 🙂)

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