nvexec `maxwell_cpu_st` example crash in Debug mode

[ericniebler]

From this test run:

+ ./build/examples/nvexec/maxwell_cpu_st --iterations=1000 --N=512 --run-cpp --run-inline-scheduler
/__w/_temp/0a57adcd-3e66-4b56-9db8-592ca5c0ba7d.sh: line 17:  4158 Segmentation fault      (core dumped) ./build/examples/nvexec/maxwell_cpu_st --iterations=1000 --N=512 --run-cpp --run-inline-scheduler
Error: Process completed with exit code 139.