[llvm] r354746 - [CGP] add special-cases to form unsigned add with overflow (PR40486)

[Sanjay Patel via llvm-commits]

Taking a look now...not sure if this is just an artifact of the reduction,
but I see 4 of these:
repro.cc:188:3: warning: control reaches end of non-void function
[-Wreturn-type]
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