[llvm] [IA]: Construct (de)interleave4 out of (de)interleave2 (PR #89276)

[Hassnaa Hamdi via llvm-commits]

hassnaaHamdi wrote:

@topperc Sorry Craig, I had to remove the code related to RISCV target because the solution was changed.
I resolved your comments that could be related to the current change.
Sorry about your time and thanks for your help.

https://github.com/llvm/llvm-project/pull/89276