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).

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