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;

- David

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