Reorder do_constant_folding_cond test to satisfy valgrind. Fix value of MAX_OPC_PARAM_IARGS. Add opcodes for vector nand, nor, eqv. Support vector nand, nor, eqv on PPC and S390X hosts. Support AVX512VL, AVX512BW, AVX512DQ, and AVX512VBMI2. Support 32-bit guest addresses as signed values.