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

[Nikita Popov via llvm-commits]

nikic wrote:

> Yes, I guess this was just a remnant of the old PredicateInfo with ssa.copy. Does it make sense to keep the test?

Yeah, extra test coverage isn't going to hurt...

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