[SYCL][CUDA] Unoptimized stream regression test

Previously the CUDA backend would fail due to invalid atomic memory
orders not being optimized out. The use of these invalid memory orders
have been removed in recent changes, so this commit adds a regression
test to make sure they do not resurface.

Signed-off-by: Steffen Larsen <[email protected]>

Author: Steffen Larsen

SYCL/Regression/unoptimized_stream.cpp

@@ -0,0 +1,15 @@
+// RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -O0 -o %t.out
+// RUN: %HOST_RUN_PLACEHOLDER %t.out
+// RUN: %CPU_RUN_PLACEHOLDER %t.out
+// RUN: %GPU_RUN_PLACEHOLDER %t.out
+
+#include <sycl/sycl.hpp>
+
+int main() {
+  sycl::queue q;
+  q.submit([&](sycl::handler &cgh) {
+    sycl::stream os(1024, 256, cgh);
+    cgh.single_task([=]() { os << "test"; });
+  });
+  return 0;
+}