[llvm] Reland "[LV]: Teach LV to recursively (de)interleave." (PR #125094)

[Hassnaa Hamdi via llvm-commits]

hassnaaHamdi wrote:

Hi @fhahn Are you going to reopen your draft and make a pull request ? or I append it to my patch here #125008 ?
I'm fine with the faster approach. Thank you.

https://github.com/llvm/llvm-project/pull/125094