nvfuser opinfo test fixes masked_var/std (#77273)
Enables guard mode in opinfo tests.
Fixes opinfo failures for
test_nvfuser_correctness__masked_var_cuda_xxxx
test_nvfuser_correctness__masked_std_cuda_xxxx
The root cause of the failure is that tracing changes stride properties and causes nvfuser to use wrong kernel and generate wrong results.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/77273
Approved by: https://github.com/davidberard98
