[llvm] [IRBuilder] Fold binary intrinsics (PR #80743)

[Yingwei Zheng via llvm-commits]

================
@@ -3163,8 +3180,12 @@ static Constant *ConstantFoldScalarCall(StringRef Name,
   if (Operands.size() == 1)
     return ConstantFoldScalarCall1(Name, IntrinsicID, Ty, Operands, TLI, Call);
 
-  if (Operands.size() == 2)
-    return ConstantFoldScalarCall2(Name, IntrinsicID, Ty, Operands, TLI, Call);
+  if (Operands.size() == 2) {
+    if (auto *FoldedLibCall = ConstantFoldLibCall2(Name, Ty, Operands, TLI)) {
+      return FoldedLibCall;
+    }
----------------
dtcxzyw wrote:

```suggestion
    if (Constant *FoldedLibCall = ConstantFoldLibCall2(Name, Ty, Operands, TLI))
      return FoldedLibCall;
```


https://github.com/llvm/llvm-project/pull/80743