[llvm] [ValueTracking][NFC] Drop outdated TODO in canCreateUndefOrPoison (PR #139915)

[Florian Hahn via llvm-commits]

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@@ -7788,8 +7788,6 @@ static bool canCreateUndefOrPoison(const Operator *Op, UndefPoisonKind Kind,
   case Instruction::FRem:
     return false;
   case Instruction::GetElementPtr:
-    // inbounds is handled above
-    // TODO: what about inrange on constexpr?
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fhahn wrote:

with the comment gone, fold the `GetElementPtr` case to the cases above?

https://github.com/llvm/llvm-project/pull/139915