steakhal wrote:

When asked some AI to confirm that this is NFC, it told me that there might be 
an issue:

Previously, when both `StateTrue` and `StateFalse` were `null` (the symbolic 
condition is unsatisfiable in the current state), `Pred` remained in the 
Frontier/Dst because `NodeBuilder::generateNode` was never called and could 
never erase it. With this patch, that path is dropped: no `Dst.insert(Pred)` 
runs.

I'm not sure, but AFAIK `StateTrue` and `StateFalse` could be null at the same 
time, so this sounds plausible to me.

https://github.com/llvm/llvm-project/pull/204371
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