[llvm] [VN] be more consistent about forwarding null inputs and ignoring SVE outputs (PR #139574)

[Nikita Popov via llvm-commits]

https://github.com/nikic commented:

Loads/stores of aggregate type are non-canonical -- we shouldn't go out of the way to handle them. Does this change provide benefits for cases not involving aggregate types?

https://github.com/llvm/llvm-project/pull/139574