[VPlan] Optimize BranchOnTwoConds to chain of 2 simple branches. (#174016) This patch improves the lowering for BranchOnTwoConds added in https://github.com/llvm/llvm-project/pull/172750 by replacing the branch on OR with a chain of 2 branches. On Apple M cores, the new lowering is ~8-10% faster for std::find-like loops. It also makes it easier to determine the early exits in VPlan. I am also planning on extensions to support loops with multiple early exits and early-exits at different positions, which should also be slightly easier to do with the new representation. PR: https://github.com/llvm/llvm-project/pull/174016
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