RTEMS | libdebugger/rtems-debugger-arm.c: Warning for using defined() in expansion (!719)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/719

Project:Branches: joel/rtems:issue-5328-rtems-debugger-arm.c to rtems/rtos/rtems:main
Author:   Joel Sherrill
Assignee: Joel Sherrill
Reviewers: Chris Johns and Kinsey Moore


## Summary

libdebugger/rtems-debugger-arm.c: Warning for using defined() in expansion

The definition of NEEDS_THUMB_SWITCH was not portable and flagged by
the GCC -Wexpansion-to-defined. It is not portable to expand a macro
which uses futher cpp directives.

Closes #5328.


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