!fixup add llvm_abi annotation

Author: antoniofrighetto

llvm/include/llvm/IR/Argument.h

@@ -79,7 +79,7 @@ class Argument final : public Value {
   LLVM_ABI bool hasByValAttr() const;
 
   /// Return true if this argument has the dead_on_return attribute.
-  bool hasDeadOnReturnAttr() const;
+  LLVM_ABI bool hasDeadOnReturnAttr() const;
 
   /// Return true if this argument has the byref attribute.
   LLVM_ABI bool hasByRefAttr() const;