[llvm] [LLVM] Add option to store Parent-pointer in ilist_node_base (PR #94224)

[Danial Klimkin via llvm-commits]

dklimkin wrote:

Sent you https://github.com/llvm/llvm-project/pull/96053 but I'd prefer passing around the parent type directly. Adding to the options makes things messy, I did try that. Thanks!

https://github.com/llvm/llvm-project/pull/94224