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.
Add missing END() macros, as per rev 184547 for amd64. The lack of theseis mostly harmless, but it does upset some of valgrind's functionality.
MFp4: Reduce code size by 26 bytes by only aligning the jump targets thatare at the top of loops.
MFp4: Pentium/Athlon-optimised implementation of wmemchr().