target-tilegx: Implement v*add and v*sub instructions [rth: Implement everything inline; handle v1addi and v2addi as well.] Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com> Message-Id: <1442873918-3394-1-git-send-email-gang.chen.5i5j@gmail.com> Signed-off-by: Richard Henderson <rth@twiddle.net>