TPTools: Suppress some undefined behavior sanitizer warnings.

Suppress some warnings from the undefined behavior sanitizer that originate
from the unsafe #defines of the TPTools classes.  This was fixed properly
in master, but we don't want to backport, so just suppress the warnings
in 21.0.  Needed to fix test failures in some *AthenaPool packages.



Former-commit-id: c74adb3913d6f9c34a68468f5bfa310f6a1d6759