s390x: reconsider "long displacement" requirement.  We currently
require that the host supports accessing memory using long
displacement. On older machines e.g. z900 that is an expensive
operation, because it is millicoded. It would be a performance win to
relax that requirement.  (VEX side changes.)  See #268620.
(Florian Krohm, britzel@acm.org)



git-svn-id: svn://svn.valgrind.org/vex/trunk@2126 8f6e269a-dfd6-0310-a8e1-e2731360e62c
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