mips: fix shra.ph: correctly get shift value
mips: fix shra.ph: correctly get shift value

okuoku/nmosh-orc,mojaves/orc,okuoku/nmosh-orc,mojaves/orc,mojaves/orc,jpakkane/orc,Distrotech/orc,ijsf/OpenWebRTC-orc,MOXfiles/orc,ijsf/OpenWebRTC-orc,jpakkane/orc,MOXfiles/orc,Distrotech/orc,MOXfiles/orc,jpakkane/orc,ijsf/OpenWebRTC-orc,okuoku/nmosh-orc,Distrotech/orc