Comment 5 for bug 1883268

There's nothing wrong with the atomic operation, which
makes sense since it's against a NULL pointer. The
problem that I see is in the unwinding -- the catch
never happens and std::terminate gets called.

There must be some sort of 32-bit TCG error though,
because the same binary works on x86_64 host.

The most confusing thing about this test case is that
12 previous throws work correctly, but the 13th fails.