Add more test cases: sqdmulh, sqrdmulh, sqshl, uqshl, sqrshl, uqrshl,
sqrshrn, uqrshrn, sqshrn, uqshrn, sqrshrun, sqshrun.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13968 a5019735-40e9-0310-863c-91ae7b9d1cf9