Tests (LPC176x): Emergency Parser (#17967)

Marlin/Configuration_adv.h

 // Enable an emergency-command parser to intercept certain commands as they
 // enter the serial receive buffer, so they cannot be blocked.
 // Currently handles M108, M112, M410
-// Does not work on boards using AT90USB (USBCON) processors!
+// Does not work on boards using AT90USB (USBCON), ESP32, STM32F1/4/7, or Teensy 3.5/3.6 processors!
 //#define EMERGENCY_PARSER
 
 // Bad Serial-connections can miss a received command by sending an 'ok'

buildroot/share/tests/LPC1768-tests

            BABYSTEPPING BABYSTEP_XY BABYSTEP_ZPROBE_OFFSET BABYSTEP_ZPROBE_GFX_OVERLAY \
            PRINTCOUNTER NOZZLE_PARK_FEATURE NOZZLE_CLEAN_FEATURE SLOW_PWM_HEATERS PIDTEMPBED EEPROM_SETTINGS INCH_MODE_SUPPORT TEMPERATURE_UNITS_SUPPORT \
            Z_SAFE_HOMING ADVANCED_PAUSE_FEATURE PARK_HEAD_ON_PAUSE \
-           LCD_INFO_MENU ARC_SUPPORT BEZIER_CURVE_SUPPORT EXTENDED_CAPABILITIES_REPORT AUTO_REPORT_TEMPERATURES SDCARD_SORT_ALPHA
+           LCD_INFO_MENU ARC_SUPPORT BEZIER_CURVE_SUPPORT EXTENDED_CAPABILITIES_REPORT AUTO_REPORT_TEMPERATURES SDCARD_SORT_ALPHA EMERGENCY_PARSER
 opt_set GRID_MAX_POINTS_X 16
 opt_set NOZZLE_TO_PROBE_OFFSET "{ 0, 0, 0 }"
 exec_test $1 $2 "Re-ARM with NOZZLE_AS_PROBE and many features."

buildroot/share/tests/LPC1769-tests

            BABYSTEPPING BABYSTEP_XY BABYSTEP_ZPROBE_OFFSET BABYSTEP_ZPROBE_GFX_OVERLAY \
            PRINTCOUNTER NOZZLE_PARK_FEATURE NOZZLE_CLEAN_FEATURE SLOW_PWM_HEATERS PIDTEMPBED EEPROM_SETTINGS INCH_MODE_SUPPORT TEMPERATURE_UNITS_SUPPORT \
            Z_SAFE_HOMING ADVANCED_PAUSE_FEATURE PARK_HEAD_ON_PAUSE \
-           LCD_INFO_MENU ARC_SUPPORT BEZIER_CURVE_SUPPORT EXTENDED_CAPABILITIES_REPORT AUTO_REPORT_TEMPERATURES SDCARD_SORT_ALPHA
+           LCD_INFO_MENU ARC_SUPPORT BEZIER_CURVE_SUPPORT EXTENDED_CAPABILITIES_REPORT AUTO_REPORT_TEMPERATURES SDCARD_SORT_ALPHA EMERGENCY_PARSER
 opt_set GRID_MAX_POINTS_X 16
 exec_test $1 $2 "Smoothieboard with many features"