Add support for Xen hypercalls used by libvmi.  Patch from Antony Saba
(antony.saba@fireeye.com).  First of two patches from #337740.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14453 a5019735-40e9-0310-863c-91ae7b9d1cf9
Add Xen 4.4 evtchn ioctl wrappers.  Patch from Antony Saba
(antony.saba@fireeye.com).  Second of two patches from #337740.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14454 a5019735-40e9-0310-863c-91ae7b9d1cf9
Patch adding support for V4L2/media ioctls.  Patch from Hans Verkuil
(hverkuil@xs4all.nl).  Fixes #338023.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14455 a5019735-40e9-0310-863c-91ae7b9d1cf9
arm64-linux: enable sys_mlock, sys_mlockall.  Fixes #337766.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14456 a5019735-40e9-0310-863c-91ae7b9d1cf9
Fix off-by-one error in size of coredumps.  Patch from Ivo Raisr
(ivosh@ivosh.net).  Fixes #338300.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14457 a5019735-40e9-0310-863c-91ae7b9d1cf9
arm64: enable test cases for str bN, [reg, reg etc] and str hN, [reg,
reg etc].  Pertaining to #337762, vex r2943.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14458 a5019735-40e9-0310-863c-91ae7b9d1cf9