New test for sorting sanity. Note that this will fail in earlier Pythons,

New test for sorting sanity.  Note that this will fail in earlier Pythons,
in the stability tests.

Bizarre:  this takes 11x longer to run if and only if test_longexp is
run before it, on my box.  The bigger REPS is in test_longexp, the
slower this gets.  What happens on your box?  It's not gc on my box
(which is good, because gc isn't a plausible candidate here).

The slowdown is massive in the parts of test_sort that implicitly
invoke a new-style class's __lt__ or __cmp__ methods.  If I boost
REPS large enough in test_longexp, even the test_sort tests on an array
of size 64 visibly c-r-a-w-l.  The relative slowdown is even worse in
a debug build.  And if I reduce REPS in test_longexp, the slowdown in
test_sort goes away.

test_longexp does do horrid things to Win98's management of user
address space, but I thought I had made that a whole lot better a month
or so ago (by overallocating aggressively in the parser).