[llvm] [NewGVN] Don't use returned arg in memory defining intrinsics (PR #161865)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

Hm, can we just delete this entirely?

We generally replace uses of the return value with the argument as a separate fold already, so I don't think there's really a need for NewGVN to handle this.

https://github.com/llvm/llvm-project/pull/161865