mstorsjo wrote:

> Would backporting this be worthwhile?

I guess it could be considered. However in practice I'm not aware of any 
external cases that actually use the "force unwinding" functionality, outside 
of the libunwind/libcxxabi testsuite. My main motivation is having the 
`check-unwind` and `check-cxxabi` testsuites passing in Windows on ARM 
configurations. It would of course be nice to have that on the 20.x release 
branch too, but that also requires another backport in 
https://github.com/llvm/llvm-project/pull/136449 which isn't clear whether it 
can be backported or not.

Then again, this is straightforward and simple to backport, so I guess we 
could. (But we'd want #137950 and #137951 to go with it then - I'll merge them 
soon too.)

https://github.com/llvm/llvm-project/pull/137949
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