[VPlan] Materialize vector trip count using VPInstructions. (#151925) Materialize the vector trip count computation using VPInstruction instead of directly creating IR. This is one of the last few steps needed to model the full vector skeleton in VPlan. It also simplifies vector-trip count computations for scalable vectors, as we can re-use the UF x VF computation. PR: https://github.com/llvm/llvm-project/pull/151925
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