[VPlan] Simplify select !c, x, y -> select c, y, x (#147268) This is split off from #133993 On its own this simplification isn't that useful, but it allows us to make the equivalent VPBlendRecipe optimisation more generic by operating on VPInstructions. In order to actually test this without #133993, I've had to also extend the m_Not pattern matcher to also catch VPWidenRecipes, since I couldn't really think of a straightforward way to create a VPInstruction::Select with a negated condition.
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