message: masked vcall fix for CUDA mode
diff: @@ -64,17 +64,19 @@ template <typename Mask> struct VCallRAIIGuard {
  jit_prefix_push(Backend, label);
  #endif
  + Mask vcall_mask;
  if constexpr (Backend == JitBackend::LLVM) {
  - Mask vcall_mask = Mask::steal(jit_var_new_stmt(
  + vcall_mask = Mask::steal(jit_var_new_stmt(
  Backend, VarType::Bool,
  "$r0 = or <$w x i1> %mask, zeroinitializer", 1, 0,
  nullptr));
  - jit_var_mask_push(Backend, vcall_mask.index(), 0);
  + } else {
  + vcall_mask = true;
  }
  + jit_var_mask_push(Backend, vcall_mask.index(), 0);
  }
  ~VCallRAIIGuard() {
  - if constexpr (Backend == JitBackend::LLVM)
  jit_var_mask_pop(Backend);
  #if defined(ENOKI_VCALL_DEBUG)
  jit_prefix_pop(Backend);
  