Adds the evex-promoted opcodes vpminsb, vpminsw, vpminsd, vpmaxsb, vpmaxsw, vpmaxsd, vpminub, vpminuw, vpminud, vpmaxub, vpmaxuw, vpmaxud.
Adds the new AVX-512 opcodes vpminsq, vpmaxsq, vpminuq, vpmaxuq.
Adds tests for above.
Opcodes have been checked against llvm-mc, binutils/gas/objdump and capstone.
Issue: #1312