[llvm] [libsycl] add single_task (PR #192499)

[Alexey Bader via llvm-commits]

================
@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file contains helper function to query kernel info that is uniform
+/// between different submissions of the same kernel.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBSYCL_GET_DEV_INFO
----------------
bader wrote:

```suggestion
#ifndef _LIBSYCL___IMPL_DETAIL_GET_DEVICE_KERNEL_INFO_HPP
```

https://github.com/llvm/llvm-project/pull/192499