[VPlan] Remove ComputeAnyOfResult, use ComputeReductionResult. (#190039)
ComputeAnyOfResult is simply a boolean OR reduction. Remove the
dedicated opcode and model directly via ComputeReductionResult.
This simplifies and unifies the code, as well as enabling trivial
constant folding.
PR: https://github.com/llvm/llvm-project/pull/190039