[llvm] [VPlan] Remove redundant x && (y && x) -> x && y combine (PR #213219)

[Luke Lau via llvm-commits]

lukel97 wrote:

> Hm, interesting innovation, but I think it could lead to confusion due to the existing design of PatternMatch?

It's not an innovation, its copied over from `m_Value(Value *&V, const Pattern &P)` in PatternMatch.h

https://github.com/llvm/llvm-project/pull/213219