[VPlan] Manage created blocks directly in VPlan. (NFC) (#120918) This patch changes the way blocks are managed by VPlan. Previously all blocks reachable from entry would be cleaned up when a VPlan is destroyed. With this patch, each VPlan keeps track of blocks created for it in a list and this list is then used to delete all blocks in the list when the VPlan is destroyed. To do so, block creation is funneled through helpers in directly in VPlan. The main advantage of doing so is it simplifies CFG transformations, as those do not have to take care of deleting any blocks, just adjusting the CFG. This helps to simplify https://github.com/llvm/llvm-project/pull/108378 and https://github.com/llvm/llvm-project/pull/106748. This also simplifies handling of 'immutable' blocks a VPlan holds references to, which at the moment only include the scalar header block. PR: https://github.com/llvm/llvm-project/pull/120918
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