stackchk: Add RTEMS_SYSINIT_ISR_STACK

Use a dedicated system initialization step for the stack checker
interrupt stack support.

Update #3838.

cpukit/include/rtems/sysinit.h

@@ -28,6 +28,7 @@ extern "C" {
  */
 #define RTEMS_SYSINIT_RECORD                     000100
 #define RTEMS_SYSINIT_BSP_EARLY                  000140
+#define RTEMS_SYSINIT_ISR_STACK                  000200
 #define RTEMS_SYSINIT_BSP_WORK_AREAS             000200
 #define RTEMS_SYSINIT_BSP_START                  000300
 #define RTEMS_SYSINIT_CPU_COUNTER                000400

cpukit/libmisc/stackchk/check.c

@@ -513,6 +513,6 @@ static void Stack_check_Prepare_interrupt_stacks( void )
 
 RTEMS_SYSINIT_ITEM(
   Stack_check_Prepare_interrupt_stacks,
-  RTEMS_SYSINIT_BSP_WORK_AREAS,
-  RTEMS_SYSINIT_ORDER_SECOND
+  RTEMS_SYSINIT_ISR_STACK,
+  RTEMS_SYSINIT_ORDER_MIDDLE
 );