[VPlan] Introduce explicit broadcasts for live-ins. (#124644) Add a new VPInstruction::Broadcast opcode and use it to materialize explicit broadcasts of live-ins. The initial patch only materlizes the broadcasts if the vector preheader dominates all uses that need it. Later patches will pick the best valid insert point, thus retiring implicit hoisting of broadcasts from VPTransformsState::get(). PR: https://github.com/llvm/llvm-project/pull/124644
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