[clang] [flang] [llvm] [mlir] [IRBuilder] Use ptrtoaddr in CreatePtrDiff() (PR #181855)

[Nikita Popov via cfe-commits]

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nikic wrote:

Hm, I don't think "C style" is really the right way to describe this, as this kind of operation is not really specific to C...

https://github.com/llvm/llvm-project/pull/181855