Use cold functions for panic formatting Option::expect, Result::unwrap etc

Option::expect, Result::unwrap, unwrap_err, expect

These methods are marked inline, but insert a big chunk of formatting
code, as well as other error path related code, such as deallocating
a std::io::Error if you have one.

We can explicitly separate out that code path into a function that is
never inline, since the panicking case should always be rare.

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