some tests fail with -O (assertions off)

On main (3.12 branch):

% ./python.exe -Om test -j2
[...]
10 tests failed:
test_clinic test_coroutines test_dis test_imaplib
test_multiprocessing_forkserver test_multiprocessing_spawn
test_py_compile test_sys_settrace test_wsgiref test_zipimport

This seems wrong because
(1) it indicates that some assertions should be exceptions instead.
(2) it implies that we don't have a buildbot testing with -O