Subzero, MIPS32: lowerUnreachable Patch implements lowerUnreachable and encoding for teq instruction. To avoid duplicated code, class describing trap instruction is borrowed from https://codereview.chromium.org/2339323004/ Review URL: https://codereview.chromium.org/2350903002 . Patch from Srdjan Obucina <Srdjan.Obucina@imgtec.com>.