[llvm] [IA] Relax the requirement of having ExtractValue users on deinterleave intrinsic (PR #148716)

[Philip Reames via llvm-commits]

preames wrote:

FYI, I posted https://github.com/llvm/llvm-project/pull/148892.  This is mostly just to force us not to forget about the one-active case when considering API design.  I'm still planning on trying this as a combine, but wanted the quick and easy version in place while I did.  

https://github.com/llvm/llvm-project/pull/148716