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c9635e51b5
Simplify some code for lowering THIR patterns I've been playing around with some radically different ways of storing THIR patterns, and while those experiments haven't yet produced a clear win, I have noticed various smaller things in the existing code that can be made a bit nicer. Some of the more significant changes: - With a little bit of extra effort (and thoughtful use of Arc), we can completely remove an entire layer of `'pat` lifetimes from the intermediate data structures used for match lowering. - In several places, lists of THIR patterns were being double-boxed for no apparent reason.