[llvm] [TLI] Add support for nan libfunc (PR #101356)

[Yingwei Zheng via llvm-commits]

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@@ -279,6 +279,9 @@ bool llvm::inferNonMandatoryLibFuncAttrs(Function &F,
     Changed |= setNonLazyBind(F);
 
   switch (TheLibFunc) {
+  case LibFunc_nan:
+  case LibFunc_nanf:
+  case LibFunc_nanl:
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dtcxzyw wrote:

> Error handling
This function is not subject to any of the error conditions specified in [math_errhandling](https://en.cppreference.com/w/c/numeric/math/math_errhandling).

https://github.com/llvm/llvm-project/pull/101356