Implement lswi and lswx.  The generated IR should be good for
instrumentation by memcheck and does not reference any memory it
should not.  Unfortunately the IR is long and inefficient.



git-svn-id: svn://svn.valgrind.org/vex/trunk@1374 8f6e269a-dfd6-0310-a8e1-e2731360e62c
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