message: Add conversion instructions into expressions parser
diff: @@ -44,6 +44,9 @@ parser_result<code> parse_expr(const uint8_t* pos)
  case instr::i32_shr_u:
  case instr::i32_rotl:
  case instr::i32_rotr:
  + case instr::i32_wrap_i64:
  + case instr::i64_extend_i32_s:
  + case instr::i64_extend_i32_u:
  break;
  case instr::local_get:
  