llvm-project

20d491bb - [VPlan] Remove re-using vector PH in VPBasicBlock::execute (NFC).

[VPlan] Remove re-using vector PH in VPBasicBlock::execute (NFC). Remove logic to re-use the previous basic block for the vector pre header from VPBasicBlock::execute. The preheader is now modeled as VPIRBasicBlock, so the code is no longer needed. Split off from https://github.com/llvm/llvm-project/pull/108378.