Implement the name_to_handle_at system call for x86 and amd64.
Based on patch from Asmadeus to fix BZ#308930.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13304 a5019735-40e9-0310-863c-91ae7b9d1cf9
announce fix for 309823 Generate errors for still reachable blocks
Functionality is provided via the new 3.9.0 arg
    --errors-for-leak-kinds=kind1,kind2,..  which leak kinds are errors?
                                            [definite,possible]
        where kind is one of definite indirect possible reachable all none

that was committed in rev 13170.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13305 a5019735-40e9-0310-863c-91ae7b9d1cf9