RTEMS | Address -Wclobbered warning in two tests (!759)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/759

Project:Branches: joel/rtems:address-fix-clobbered-warnings to rtems/rtos/rtems:main
Author:   Joel Sherrill
Assignee: Joel Sherrill
Reviewers: Kinsey Moore and Gedare Bloom


## Summary

Code should not rely on the contents of local variables set before setjmp() after the longjmp() returns. 

Neither use case in these patches was addressed by adding the "returns_twice" attribute to setjmp() in setjmp.h.

Updates #5365.

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