[llvm] [SelectionDAG][AArch64] Legalize vector.[de]interleave6 (PR #193723)

[Paul Walker via llvm-commits]

https://github.com/paulwalker-arm approved this pull request.

I manually tried (de)interleave factors of 6 and 12 and the logic looks sound to me.

https://github.com/llvm/llvm-project/pull/193723