[libc][uefi] add startup integration test

Author: RossComputerGuy

libc/test/integration/startup/uefi/CMakeLists.txt

@@ -0,0 +1,9 @@
+add_custom_target(libc-startup-tests)
+add_dependencies(libc-integration-tests libc-startup-tests)
+
+add_integration_test(
+  startup_no_args_test
+  SUITE libc-startup-tests
+  SRCS
+    main_without_args.cpp
+)

libc/test/integration/startup/uefi/main_without_args.cpp

@@ -0,0 +1,11 @@
+//===-- Loader test for main without args ---------------------------------===//
+//
+// 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 "test/IntegrationTest/test.h"
+
+TEST_MAIN() { return 0; }