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
5 files changed