[llvm] [GlobalIsel] Combine ADDO (PR #82927)

[Thorsten Schütt via llvm-commits]

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@@ -429,6 +431,23 @@ class GAddSubCarryOut : public GBinOpCarryOut {
   }
 };
 
+/// Represents overflowing add operations.
+/// G_UADDO, G_SADDO
+class GAddCarryOut : public GBinOpCarryOut {
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tschuett wrote:

The common pattern is to assert that only the expected opcode is in `MI`. I use `cast<GAddCarryOut>`. I don't want unnoticed sub to come in.

https://github.com/llvm/llvm-project/pull/82927