message: fixed compiler mixed type issue
diff: @@ -81,8 +81,8 @@ int main(int argc, char* argv[])
  }},
  {"dpcpp",
  [] {
  - return gko::DpcppExecutor::create(0,
  - gko::OmpExecutor::create());
  + return gko::DpcppExecutor::create(
  + 0, gko::ReferenceExecutor::create());
  }},
  {"reference", [] { return gko::ReferenceExecutor::create(); }}};
  @@ -139,14 +139,14 @@ int main(int argc, char* argv[])
  auto smoother_gen = gko::share(
  ir::build()
  .with_solver(inner_solver_gen)
  - .with_relaxation_factor(0.9)
  + .with_relaxation_factor(static_cast<ValueType>(0.9))
  .with_criteria(
  gko::stop::Iteration::build().with_max_iters(2u).on(exec))
  .on(exec));
  auto smoother_gen_f = gko::share(
  ir_f::build()
  .with_solver(inner_solver_gen_f)
  - .with_relaxation_factor(0.9)
  + .with_relaxation_factor(static_cast<MixedType>(0.9))
  .with_criteria(
  gko::stop::Iteration::build().with_max_iters(2u).on(exec))
  .on(exec));
  @@ -159,14 +159,14 @@ int main(int argc, char* argv[])
  auto coarsest_gen = gko::share(
  ir::build()
  .with_solver(inner_solver_gen)
  - .with_relaxation_factor(0.9)
  + .with_relaxation_factor(static_cast<ValueType>(0.9))
  .with_criteria(
  gko::stop::Iteration::build().with_max_iters(4u).on(exec))
  .on(exec));
  auto coarsest_gen_f = gko::share(
  ir_f::build()
  .with_solver(inner_solver_gen_f)
  - .with_relaxation_factor(0.9)
  + .with_relaxation_factor(static_cast<MixedType>(0.9))
  .with_criteria(
  gko::stop::Iteration::build().with_max_iters(4u).on(exec))
  .on(exec));
  