[llvm] [SimplifyLibCalls] Constant fold nan libcall (PR #101459)

[Nikita Popov via llvm-commits]

================
@@ -3858,6 +3858,22 @@ Value *LibCallSimplifier::optimizeStringMemoryLibCall(CallInst *CI,
   return nullptr;
 }
 
+/// Constant folding nan/nanf/nanl.
+static Value *optimizeNaN(CallInst *CI) {
+  StringRef CharSeq;
+  if (!getConstantStringInfo(CI->getArgOperand(0), CharSeq))
+    return nullptr;
+
+  llvm::APInt Fill;
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nikic wrote:

```suggestion
  APInt Fill;
```

https://github.com/llvm/llvm-project/pull/101459