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catch handlers are now also translated by the virtualizing pattern matcher
emit type-based switches when possible, fallback to catch-all with full pattern match
(the logic used to emit constant-based switches was generalized to type-based switches,
abstracting out how to refer to the scrutinee and the shape of a default/catch-all case)
this was the last missing piece of essential functionality
now the virtualizing pattern matcher and the old one are mutually exclusive:
-Yvirtpatmat disables the old matcher logic completely
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