[llvm] Constant Fold Logf128 calls (PR #84501)

[Matt Arsenault via llvm-commits]

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@@ -299,6 +300,9 @@ class IEEEFloat final : public APFloatBase {
   IEEEFloat(const fltSemantics &, integerPart);
   IEEEFloat(const fltSemantics &, uninitializedTag);
   IEEEFloat(const fltSemantics &, const APInt &);
+#ifdef __FLOAT128__
+  explicit IEEEFloat(float128 ld);
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arsenm wrote:

Don't expose non-portable APFloat APIs? 

https://github.com/llvm/llvm-project/pull/84501