WIP: stacktrace tests

TODO:
* Write a commit message
* Check if this needs dereference_function_descriptor()
* Fix CONFIG guards
* Expand Kconfig text
* Add fgraph scenarios
* Add kretprobe scenarios
* Add exception-boundary tests
* Add unreliable scenarios
* Add clear comments

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
6 files changed