[VPlan] Add initial CFG simplification, removing BranchOnCond true.#106748
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[VPlan] Add initial CFG simplification, removing BranchOnCond true.#106748
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Add an initial CFG simplification transform, which removes the dead edges for blocks terminated with BranchOnCond true.
At the moment, this removes the edge between middle block and scalar preheader when folding the tail.
Note: not all tests have been updated yet, but the current tests give a good idea of the change.