target-tilegx: Implement v*shl, v*shru, and v*shrs instructions v2sh* are implemented with helper functions; v4sh* are implmeneted with inline code. Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Message-Id: <1442872055-2836-1-git-send-email-gang.chen.5i5j@gmail.com> Signed-off-by: Richard Henderson <rth@twiddle.net>