[llvm] [CodeGen] This patch fix a bug that may caused error for a self-defined target in SelectionDAG::getNode (PR #75320)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

> > > I guess this is broken by this patch https://lab.llvm.org/buildbot/#/builders/238/builds/7108
> > 
> > 
> > Why do you suspect this patch?
> 
> No PPC related patches and the next in the stack is SelectionDAGBuilder this patch is the only one related to SelectionDAG

That was my guess, and it was wrong. Local bisect shows f5687636415969e6d945659a0b78734abdfb0f06

https://github.com/llvm/llvm-project/pull/75320