Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.Approved by: re (implicit)Sponsored by: The FreeBSD Foundation
Add section .note.GNU-stack for assembly files used by 386 and amd64.
Use hardware remainder on amd64 since it is 5 to 10 times faster thansoftware remainder and is already used for remquo().