[llvm] [X86] Fold vpmadd52h/l for pattern X * 0 + Y --> Y (PR #156086)

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XChy wrote:

Folds like `X * 1 + Y -> X + Y`, `C1 * C2 + Y -> C3 + Y` may help too.

https://github.com/llvm/llvm-project/pull/156086

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