[llvm] [LV] Add vplan folds for (X - (X & Y)) -> (X & ~Y) (PR #226466)

[David Sherwood via llvm-commits]

david-arm wrote:

> Not sure what the fix for this is yet

That's strange because the vplan fold mirrors what instcombine would do anyway!

https://github.com/llvm/llvm-project/pull/226466