Mark as XFAIL: run-mode test that can pass build stage

Author: ayylol

sycl/test-e2e/AddressSanitizer/nullpointer/private_nullptr.cpp

@@ -7,7 +7,7 @@
 // RUN: %{run} not %t3.out 2>&1 | FileCheck %s
 
 // FIXME: There's an issue in gfx driver, so this test pending here.
-// XFAIL: *
+// XFAIL: run-mode
 
 #include <sycl/detail/core.hpp>
 #include <sycl/ext/oneapi/experimental/address_cast.hpp>