This is not entirely satisfactory either, because I don’t see why this
barrier would be needed.  It could be a GCC bug, as this file is a real
stress test.  Ideas?

Unless someone comes up with a better idea, I’ll commit a portable
version of the above patch.

(Tested on sparc64-unknown-linux-gnu and hppa2.0-unknown-linux-gnu.)

Thanks,
Ludo’.