[llvm] [X86] computeKnownBitsForTargetNode - add INTRINSIC_WO_CHAIN handling for PSADBW intrinsics (PR #83580)

[via llvm-commits]

goldsteinn wrote:

> I can merge this with the WIP patch I have for #81765 as long as everyone is happy with me adding the precendent of supporting INTRINSIC_WO_CHAIN as part of it - I tend to to prefer bitesize patches where possible, so keeping them separate made more sense in my head.

Fair enough.

Im strongly in favor of supporting `INTRINSIC_WO_CHAIN`

https://github.com/llvm/llvm-project/pull/83580