RTEMS | Add another machine exception signal map test (!868)

[yang zhang (@yang.zhang)]

yang zhang commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/868#note_137071


No an accompanying fix in cpukit.
I just add a fix in 'fault_handler', it's the smallest change but not good solution.
Currently only `aarch64` and `microblaze` support this. `aarch64` would check whether need dispatch by thread_dispatch_disable_level/dispatch_necessary/isr_dispatch_disable, but `microblaze` only by thread_dispatch_disable_level/dispatch_necessary.
Maybe should do a fix in `_CPU_Exception_dispatch_and_resume` for `isr_dispatch_disable` not in 'fault_handler', do you have a good idea?

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/868#note_137071
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