lightrec: Don't disassemble the wrapper block
emitter: Recompile ADDI/ADDIU/SLTI/SLTIU/ANDI/ORI/XORI
emitter: Recompile ADDU/ADD/SUBU/SUB/AND/OR/XOR/NOR/SLTU/SLT
emitter: Recompile JAL, JALR, BLTZAL, BGEZAL
emitter: Factorize code of B* functions