Subzero, MIPS32: Instruction NOR, pseudoinstruction NOT

These two are prerequisites for some intrinsic calls and
bitwise operations.

R=stichnot@chromium.org

Review URL: https://codereview.chromium.org/2356293002 .

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