[objc] 64-bit failures

[Eric Botcazou]

> FAIL: objc.dg/call-super-2.m (test for excess errors)
> FAIL: objc.dg/desig-init-1.m (test for excess errors)

Do you see these ones too (like on SPARC64)?

FAIL: objc.dg/encode-2.m execution test
FAIL: objc.dg/encode-3.m execution test
FAIL: objc.dg/proto-qual-1.m execution test

There are sizeof()s all over the place, so this could be an int/long problem 
too.

-- 
Eric Botcazou