[llvm] [LLVM][MemCpyOpt] Unify alias tags if we optimize allocas (PR #129537)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

Looks basically fine to me.

I'd recommend rebasing this. The surrounding code has changed significantly, even if Git thinks it merges cleanly.

https://github.com/llvm/llvm-project/pull/129537