RTEMS | bsps/m68k: The link scripts discard the exception frames (#5703)

[Sebastian Huber (@sebhub)]

Issue created by Sebastian Huber: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5703



The link scripts of `av5282`, `mcf5235` and `mcf5329` collect the exception
frames without `KEEP()`, so `--gc-sections` removes the terminating zero word
which `crtend.o` contributes. `crtbegin.o` gives `__register_frame_info()` the
start of the table and the unwinder walks the entries until it finds a zero
length. It never finds one, walks past the end and reads whatever follows, so
every throw ends in a fatal exception.

This description was created with Claude Code assistance.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5703
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