[macOS] Add SIGTRAP to the crash handler.

[bruvzg]

Fixes #87718

It's unnecessary for other platforms and not triggered by real crashes, but useful to get trace from OS.crash call.

[Calinou]

Tested locally, it mostly works as expected.

I can see #61906 partially working: window title is changed and crash backtrace is printed to stdout (and log file), but the window never exits and I don't see the alert appearing like I do on Windows and Linux.

That said, this may just be due to OS::alert() blocking the handler in a different way than on Windows and Linux. I may have to skip OS::alert() on macOS and just open the log file directly with the default program.

[bruvzg]

That said, this may just be due to OS::alert() blocking the handler in a different way than on Windows and Linux. I may have to skip OS::alert() on macOS and just open the log file directly with the default program.

In case of macOS, OS::alert require event loop to run, otherwise it won't show (or will be unresponsive).

[Calinou]

This is fully functional with the latest revision of #61906, so this should be good to go.

[akien-mga]

Thanks!