Subzero, MIPS32: Implement logical instructions ashr, lshr, shl

This patch adds support for logical operations ashr, lshr and shl.

R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/1975283002 .

Patch from Srdjan Obucina <Srdjan.Obucina@imgtec.com>.
5 files changed