Your patch completely broke libffi on AIX and your changes were not
Darwin-specific, despite Mike Stump's comment with his approval.
AIX shares ffi_darwin.c, as one should be able to see from all of the
AIX comments in the file.
aix_closure.S expects ffi_closure_helper_DARWIN to return the type, as
it previously did. So the following change completely breaks FFI on
/* Tell ffi_closure_ASM to perform return type promotions. */
- return cif->rtype->type;
+ return cif->rtype;