[llvm] [LSR] Deduplicate cast instructions across ICmpZero fixups (PR #201970)

[Nikita Popov via llvm-commits]

nikic wrote:

Would it be possible to share the pre and post LSR IR for the motivating sealcrypto case? I think it's a lot easier to understand when not talking in abstract...

https://github.com/llvm/llvm-project/pull/201970