remove two not used global variables:
Addr  VG_(client_base) = 0;       /* client address space limits */
Addr  VG_(client_end)  = 0;

These 2 vars are unused, and there is a comment just before
telling:
 // TODO: get rid of as many of these as possible.

So, let's do the easy part :)



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13465 a5019735-40e9-0310-863c-91ae7b9d1cf9
change macro names to properly indicate that current_stack is set
(and not current stack)



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13466 a5019735-40e9-0310-863c-91ae7b9d1cf9