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What this does is to make sure that the initial client data segment is marked as unaddressable. This is consistent with the behaviour of brk when the data segment is shrunk. The "freed" memory is marked as unaddressable. Special tweaks were needed for s390 which was returning early from the funtion to avoid sloppy register definedness initialisation. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15144