[patch] Fix PR middle-end/55321

[Ramana Radhakrishnan]

> r~
>
>
> PS: ARM still uses sjlj exceptions for Ada?  I thought with the obsolescence
> of pre-eabi targets that we'd always use unwind tables now.
>

I believe this is by choice because no one has yet written an unwinder 
for the ARM exception tables for Ada :( .

regards,
Ramana