Fix Struct Pass-By-Val crash

FunctionWrapper.cpp

@@ -78,6 +78,18 @@ struct FunctionWrapper : public ModulePass {
         // Clang Intrinsic
         return nullptr;
       }
+      for(auto argiter = tmp->arg_begin(); argiter!= tmp->arg_end(); ++argiter) {
+       Argument& arg=*(argiter);
+       if(arg.hasByValAttr()){
+        // Arguments with byval attribute yields issues without proper handling.
+        // The "proper" method to handle this is to revisit and patch attribute stealing code.
+        // Technically readonly attr probably should also get filtered out here.
+
+        // Nah too much work. This would do for open-source version since private already
+        // this pass with more advanced solutions 
+	return nullptr;       
+       }   
+      }
     }
     // Create a new function which in turn calls the actual function
     vector<Type *> types;