[llvm] [InstCombine] Don't consider aligned_alloc removable if icmp uses result (PR #69474)

[Nikita Popov via llvm-commits]

nikic wrote:

I don't think you can bail out for all aligned allocations here. For example, Rust always uses aligned allocations (via `__rust_alloc`) and will always pass a valid alignment, so I don't think we need to consider that failure mode there.

This should probably be hardcoded to `aligned_alloc` in particular.

https://github.com/llvm/llvm-project/pull/69474