RTEMS | cpukit/include/rtems/score/basedefs.h: Add RTEMS_FALL_THROUGH() (!730)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/730

Project:Branches: joel/rtems:fix-implicit-fallthrough-warnings to rtems/rtos/rtems:main
Author:   Joel Sherrill
Assignee: Joel Sherrill
Reviewer: Kinsey Moore


## Summary

cpukit/include/rtems/score/basedefs.h: Add RTEMS_FALL_THROUGH()

The RTEMS_FALL_THROUGH macro was needed to provide a portable
way to annotate that a case in a switch statement intentionally
does not have a break statement. It is known as "falling through"
and a common bug.

Adding this macro enabled addressing -Wimplicit-fallthrough warnings.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/730
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