[VPlan] Restrict hoisting of broadcast operations using VPDominatorTree (#117138) This patch restricts broadcast operations from being hoisted to the vector preheader unless the basic block that defines the broadcasted value properly dominates the vector preheader. This prevents potential use-before-definition issues when the broadcasted value is defined within the plan. VPDominatorTree is used to confirm this restriction while still allowing safe hoisting for broadcasted values defined outside the plan. Issue https://github.com/llvm/llvm-project/issues/117139
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