[VPlan] Retain exit conditions and edges in initial VPlan (NFC). (#137709) Update initial VPlan construction to include exit conditions and edges. The loop region is now first constructed without entry/exiting. Those are set after inserting the region in the CFG, to preserve the original predecessor/successor order of blocks. For now, all early exits are disconnected before forming the regions, but a follow-up will update uncountable exit handling to also happen here. This is required to enable VPlan predication and remove the dependence any IR BBs (https://github.com/llvm/llvm-project/pull/128420). PR: https://github.com/llvm/llvm-project/pull/137709
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