[llvm] [IndVars] Preserve flags of narrow IV inc if replacing with wider inc. (PR #80446)

[Nikita Popov via llvm-commits]

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@@ -1985,7 +1985,28 @@ PHINode *WidenIV::createWideIV(SCEVExpander &Rewriter) {
       // increment to the new (widened) increment.
       auto *OrigInc =
           cast<Instruction>(OrigPhi->getIncomingValueForBlock(LatchBlock));
+
       WideInc->setDebugLoc(OrigInc->getDebugLoc());
+      // We are replacing a narrow IV increment with a wider IV increment . If
----------------
nikic wrote:

```suggestion
      // We are replacing a narrow IV increment with a wider IV increment. If
```

https://github.com/llvm/llvm-project/pull/80446