Rollup merge of #136435 - Zalathar:thir-pat-stuff, r=Nadrieril

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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.

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Matthias Krüger 2025-02-06 13:10:00 +01:00 committed by GitHub

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