enable global_nullptr

Author: AllanZyne

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

@@ -6,9 +6,6 @@
 // RUN: %{build} %device_asan_flags -O2 -g -o %t3.out
 // RUN: %{run} not %t3.out 2>&1 | FileCheck %s
 
-// See https://github.com/intel/llvm/issues/15453
-// UNSUPPORTED: gpu-intel-dg2
-
 #include <sycl/detail/core.hpp>
 
 int main() {