[llvm] [DeadStoreElimination] Optimize tautological assignments (PR #75744)

[Nikita Popov via llvm-commits]

nikic wrote:

Just tried again, and there are still crashes. To clarify though, stage2 itself does build successfully, but when you try to build https://github.com/llvm/llvm-test-suite using this stage2 it crashes.

https://github.com/llvm/llvm-project/pull/75744