[llvm] [ADT] ImutAVLFactory: avoid overhead of vector for freelist (PR #196534)

[Christoph Cullmann via llvm-commits]

christoph-cullmann wrote:

Ok, https://github.com/llvm/llvm-project/commit/3d7535a03c1a036204a5347a79e9f66eb96ce4bc renamed the next to Next, will need to adjust that now.

But it would be good to know if that could be merged then, that conflict would have been avoidable.

https://github.com/llvm/llvm-project/pull/196534