Module servoshell::backtrace

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Similar to println!("{:?}", Backtrace::new()), but doesn’t allocate.

Seems to fix some deadlocks: https://github.com/servo/servo/issues/24881

FIXME: if/when a future version of the backtrace crate has https://github.com/rust-lang/backtrace-rs/pull/265, use that instead.

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