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Auto merge of #122046 - Nadrieril:integrate-or-pats2, r=matthewjasper
match lowering: handle or-patterns one layer at a time `create_or_subcandidates` and `merge_trivial_subcandidates` both call themselves recursively to handle nested or-patterns, which is hard to follow. In this PR I avoid the need for that; we now process a single "layer" of or-patterns at a time. By calling back into `match_candidates`, we only need to expand one layer at a time. Conversely, since we always try to simplify a layer that we just expanded (thanks to rust-lang/rust#123067), we only have to merge one layer at a time. r? `@matthewjasper`