java/foreign/critical/TestCriticalUpcall.java causes a VM crash
and checks crash output for "wrong thread state for upcall".
However, it also generates a core file that is not needed for
the test to pass.

For my stress test runs this test generates one core in release,
fastdebug and slowdebug runs and I do 3 runs per stress run.
That's 9 cores and on my M1 MacMini they are 4GB each so
that's 36GB in core files that I don't need.

If I don't remember to run "sysctl kern.corefile=../core.%P" every
time I reboot the M1 MacMini they start accumulating in /cores...