Optimise row parser to delay sub-binary creation

[samsondav]

No description provided.

[coveralls]

Coverage remained the same at 65.616% when pulling d4337e7 on samphilipd:row_parser_optimisations into 0e02865 on xerions:master.

[coveralls]

Coverage increased (+0.1%) to 65.753% when pulling d4337e7 on samphilipd:row_parser_optimisations into 0e02865 on xerions:master.

[coveralls]

Coverage remained the same at 65.616% when pulling d4337e7 on samphilipd:row_parser_optimisations into 0e02865 on xerions:master.

[surik]

Hi @samphilipd, can you explain your changes?

[samsondav]

@surik Sort of. I don't know why this works, but with this change three "NOT OPTIMIZED" becomes "OPTIMIZED" in the output when @compile :bin_opt_info is set.

[surik]

I'm not sure that it gives something expect some changes in compiler output with bin_opt_info option.

[fishcakez]

This change prevents a binary reference being created when decode_text_part is called in the tail of decode_text_rows but not other functions in this change. In the other cases it simply delays the reference being created to next call. It works for those cases as no pattern matching to left of the rest arg.