[llvm] [RISCV] Add integer RISCVISD::SELECT_CC to canCreateUndefOrPoison and isGuaranteedNotToBeUndefOrPoison. (PR #84693)

[Matt Arsenault via llvm-commits]

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@@ -3786,7 +3786,12 @@ bool TargetLowering::isGuaranteedNotToBeUndefOrPoisonForTargetNode(
        Op.getOpcode() == ISD::INTRINSIC_VOID) &&
       "Should use isGuaranteedNotToBeUndefOrPoison if you don't know whether Op"
       " is a target node!");
-  return false;
+
+  return !canCreateUndefOrPoisonForTargetNode(Op, DemandedElts, DAG, PoisonOnly,
+                                              /*ConsiderFlags*/ true, Depth) &&
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arsenm wrote:

```suggestion
                                              /*ConsiderFlags=*/ true, Depth) &&
```

https://github.com/llvm/llvm-project/pull/84693