Why test objc at -m64 for Darwin8?

[Jack Howarth]

   Shouldn't we have something in gcc/testsuite/lib/objc*.exp
to short-circuit out of running any of those -m64 testsuites
for Darwin8 and earlier? If we won't have 64-bit objc runtimes
in Darwin until Leopard, it seems rather pointless to test
-m64 for objc at all, no? Also, I am baffled as to how
much of it actually passes considering there isn't even
the correct architecture of runtime.
             Jack