[llvm] [DAG] shouldReduceLoadWidth - hasOneUse should check just the loaded value - not the chain (PR #128167)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

> > @arsenm any preference for updating CMakeLists or making it inline?
> 
> I don't exactly follow how only this one case needs to be inline to fix the failures. It's an all or nothing problem?

Its due to shouldReduceLoadWidth being virtual - if we inline SDNode::hasNUsesOfValue then the explicit dependency is hidden again - I'll keep with the CMakeLists approach as it should stop this being a problem again in the future.

https://github.com/llvm/llvm-project/pull/128167