X-Macro Opcode Table

Given the X-macro list already in your editor: ``c #define OP_LIST(X) X(OP_ADD) X(OP_SUB) X(OP_MUL) enum { #define OP_E(e) e, OP_LIST(OP_E) #undef OP_E OP_COUNT }; ` implement const char *op_name(unsigned op)` generating its strings from the *same* list (a second expansion with a stringizing X) — adding an opcode must extend both, or the table lies.