target-tilegx: Implement v2sh* instructions It is just according to v1sh* instructions implementation. Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Message-Id: <1443956491-26850-1-git-send-email-gang.chen.5i5j@gmail.com> Signed-off-by: Richard Henderson <rth@twiddle.net>