Allows labels to be any reasonable identifier, not just `LABEL-?[0-9+]` INSTRUCTION was changed to IDENTIFIER because if the LABEL rule is relaxed the lexer cannot tell the difference between a LABEL and a INSTRUCTION.
Allows labels to be any reasonable identifier, not just `LABEL-?[0-9+]` INSTRUCTION was changed to IDENTIFIER because if the LABEL rule is relaxed the lexer cannot tell the difference between a LABEL and a INSTRUCTION.