[llvm] [DAG] isGuaranteedNotToBeUndefOrPoison - ISD::LOAD nodes are not poison if the LoadSDNode is known to be dereferenceable (PR #160884)

[Nuno Lopes via llvm-commits]

nunoplopes wrote:

If we are talking about the result of a load (as it seems, but I'm not an expert in SDAG), then it can be poison or undef. The patch doesn't look right.

https://github.com/llvm/llvm-project/pull/160884