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i#5475 Add feature checks to AArch64 encoder

Merged Assad Hashmi requested to merge i5475-aarch64-encoder-feature-check into master

This patch implements the codec side of the AArch64 FEATURE_ support patch, PR5491. A feature name field is added to each opcode in codec_*.txt files which is used to generate feature checks in the encoder, e.g.

    switch (instr->opcode) {
    case OP_cas:
 #     if !defined(DR_HOST_NOT_TARGET) && !defined(STANDALONE_DECODER)
       if (!proc_has_feature(FEATURE_LSE))
           return ENCFAIL;
 #     endif
       enc = encode_opndsgen_08a07c00_001f03ff(pc, instr,..., di);
       if (enc != ENCFAIL)
           return enc;

Issues: #5475 (closed), #1569, #2626