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

[Hassnaa Hamdi via llvm-commits]

hassnaaHamdi wrote:

/cherry-pick https://github.com/llvm/llvm-project/commit/f07cd36a5d0e038df77a779f388b1af144915034 https://github.com/llvm/llvm-project/commit/1611059f5d57ed1ceffb1367327957f10f8658ff https://github.com/llvm/llvm-project/commit/e9a20f77ee2117b4a6eb40826b7280e29ad29e1e

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