Respect typed references in catch assignment

I decided to null out EG(exception) early here, which means only
the exception from the dtor / ref assign is preserved, and the
previous

Respect typed references in catch assignment

I decided to null out EG(exception) early here, which means only
the exception from the dtor / ref assign is preserved, and the
previous exception is not chained in. This is more robust, and
I don't think this situation is common enough to be bothered about
the precise behavior.

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