Add more test cases: sqrshrn, uqrshrn, sqshrn, uqshrn, sqrshrun,
sqshrun, sqshl, uqshl, sqshlu, sqxtn, uqxtn, sqxtun, srhadd, urhadd,
sshl, ushl, shl, sshr, ushr, ssra, usra, srshl, urshl, srshr, urshr,
srsra, ursra, suqadd, usqadd.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13969 a5019735-40e9-0310-863c-91ae7b9d1cf9