[RemoteAST] Fix function generation to form type from multiple params

If function type has multiple parameters make sure that correct
tuple type is formed before constructing function type.

Author: xedin

lib/RemoteAST/RemoteAST.cpp

@@ -342,6 +342,7 @@ class RemoteASTTypeBuilder {
         if (inOutArgs[i]) arg = InOutType::get(arg);
         elts.push_back(arg);
       }
+      input = TupleType::get(elts, Ctx);
     }
 
     return FunctionType::get(input, output, einfo);