[SYCL] Add test for device default c-tor and creating a host device

SYCL/Basic/device-ctor.cpp

@@ -0,0 +1,33 @@
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t1.out
+// RUN: %HOST_RUN_PLACEHOLDER %t1.out host
+// RUN: %CPU_RUN_PLACEHOLDER %t1.out
+// RUN: %GPU_RUN_PLACEHOLDER %t1.out
+// RUN: %ACC_RUN_PLACEHOLDER %t1.out
+// RUN: %t1.out
+
+//==------ device-ctor.cpp - SYCL device default c-tor test ----------------==//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include <CL/sycl.hpp>
+#include <cassert>
+
+int main(int argc, const char **argv) {
+  bool isHost = false;
+
+  if (argc > 1)
+    isHost = !std::string("host").compare(argv[1]);
+
+  sycl::device Dev;
+  sycl::device HostDev(sycl::host_device{});
+
+  assert(!Dev.is_host() || isHost);
+  assert(HostDev.is_host());
+
+  return 0;
+}
+