llvm-project

78eafb14 - [VPlan] Add getIndexFor(Predecessor|Successor) helpers (NFC).

[VPlan] Add getIndexFor(Predecessor|Successor) helpers (NFC). Move code to get the index of a predecessor and successor to helpers in VPBlockBase, to avoid duplication and enable future reuse. Split off from https://github.com/llvm/llvm-project/pull/140409.