Add testing for O0 opt level

Signed-off-by: Mikhail Lychkov <[email protected]>

Author: mlychkov

sycl/test/esimd/esimd_verify.cpp

@@ -1,5 +1,7 @@
 // RUN: not %clangxx -fsycl -fsycl-device-only -flegacy-pass-manager -S %s -o /dev/null 2>&1 | FileCheck %s
 // RUN: not %clangxx -fsycl -fsycl-device-only -fno-legacy-pass-manager -S %s -o /dev/null 2>&1 | FileCheck %s
+// RUN: not %clangxx -fsycl -fsycl-device-only -flegacy-pass-manager -O0 -S %s -o /dev/null 2>&1 | FileCheck %s
+// RUN: not %clangxx -fsycl -fsycl-device-only -fno-legacy-pass-manager -O0 -S %s -o /dev/null 2>&1 | FileCheck %s
 
 #include <sycl/ext/intel/experimental/esimd.hpp>