Function should_panic_hook_suppress_termination 

pub fn should_panic_hook_suppress_termination() -> bool

Returns true if embedder’s custom panic hook handler should not treat the panic as a fatal error that requires termination of the engine.

This is needed to catch and silence panics in resvg crate. servoshell registers a custom panic hook that aborts the process in hard_failmode even when usingcatch_unwind`.