[llvm] [VPlan] Plumb scalable register size through narrowInterleaveGroups (PR #167505)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> I'm just noticing that this was done as a part of #149706 but that was reverted.

I also noticed that #149706 was reverted, but somewhat mysteriously: can we maybe get a test case that caused its revert, @fhahn, and verify that this patch works with that test case?

https://github.com/llvm/llvm-project/pull/167505