[llvm] SCEV: avoid conflating unknown TC with wrap (NFC) (PR #94162)

[Thorsten Schütt via llvm-commits]

================
@@ -6463,7 +6463,7 @@ getRangeForUnknownRecurrence(const SCEVUnknown *U) {
     // TODO: Handle the power function forms some day.
     return FullSet;
 
-  unsigned TC = getSmallConstantMaxTripCount(L);
+  std::optional<unsigned> TC = getSmallConstantMaxTripCount(L);
   if (!TC || TC >= BitWidth)
----------------
tschuett wrote:

```
TC >= BitWidth
```
It compiles? We compare an optional to a BitWidth?

https://github.com/llvm/llvm-project/pull/94162