[SYCL] Add test for default async_handler

SYCL/AsyncHandler/default_async_handler.cpp

@@ -0,0 +1,24 @@
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out
+// RUN: %CPU_RUN_PLACEHOLDER %t.out &> %t.txt || true
+// RUN: %CPU_RUN_PLACEHOLDER FileCheck %s --input-file %t.txt
+// RUN: %GPU_RUN_PLACEHOLDER %t.out &> %t.txt || true
+// RUN: %GPU_RUN_PLACEHOLDER FileCheck %s --input-file %t.txt
+// RUN: %ACC_RUN_PLACEHOLDER %t.out &> %t.txt || true
+// RUN: %ACC_RUN_PLACEHOLDER FileCheck %s --input-file %t.txt
+
+#include <sycl/sycl.hpp>
+
+using namespace sycl;
+
+int main() {
+  queue Q;
+  Q.submit([&](handler &CGH) {
+     CGH.host_task([=]() {
+       throw std::runtime_error("Exception thrown from host_task.");
+     });
+   }).wait_and_throw();
+  return 0;
+}
+
+// CHECK:      Default async_handler caught exceptions:
+// CHECK-NEXT: Exception thrown from host_task.