Reapply "[VPlan] Set branch weight metadata on middle term in VPlan (NFC) (#143035)" This reverts commit 0604dc199c019b23746f4a54885ba0c75569cdae. The recommitted version addresses post-commit comments and adjusts the place the branch weights are added. It now runs before VPlans are optimized for VF and UF, which may remove the vector loop region, causing a crash trying to get the middle block after that. Test case added in 72f99b75afc12bb. Original message: Manage branch weights for the BranchOnCond in the middle block in VPlan. This requires updating VPInstruction to inherit from VPIRMetadata, which in general makes sense as there are a number of opcodes that could take metadata. There are other branches (part of the skeleton) that also need branch weights adding. PR: https://github.com/llvm/llvm-project/pull/143035
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