Comment # 10 on bug 1204267 from Aaron Puchert

(In reply to Fabian Vogt from comment #9)
> So the missing "instcombine" pass causes the "Cannot select" error and the
> pass is missing
> because Mesa passes an invalid list of passes to LLVMRunPasses and ignores
> the error.

Would it be possible to improve error handling here? At least some tracing
would be nice. From your analysis it looks like this might affect more
platforms and not just armv7, and we wouldn't have noticed anything were it not
for the backend bug.