[llvm] [LSROA] Add logical SROA pass (PR #192058)

[Nikita Popov via llvm-commits]

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https://github.com/nikic approved this pull request.

The LangRef wording LGTM now. The implementation is overly conservative with these changes -- really we only need to exclude cases where the address of the alloca is observed, because that's not covered by the aliasing rules. But I'm fine with landing the conservative implementation first.

https://github.com/llvm/llvm-project/pull/192058