[llvm] [VPlan] Handle VPWidenCastRecipe without underlying value in EVL transform (PR #120194)

[Luke Lau via llvm-commits]

lukel97 wrote:

> LGTM, thanks!
> 
> 
> 
> It looks like https://lab.llvm.org/buildbot/#/builders/132 isn't working properly? I only see a large number of old build requests, but no actual builds.

Woops, looks like the active builder is on staging now: https://lab.llvm.org/staging/#/builders/16

https://github.com/llvm/llvm-project/pull/120194