Rollup merge of #123067 - Nadrieril:always-simplify-or, r=oli-obk

match lowering: consistently merge simple or-patterns

There are two places where we expand or-patterns in match lowering: the main one is `test_candidates_with_or`, and there's one in `match_candidates` that's an optimization for the simple case where the whole pattern is just one or-pattern.

To reduce duplication, we merge or-pattern alternatives into a single block when possible, but we only to that in `test_candidates_with_or`. This PR fixes this oversight and merges them in `match_candidates` too.

This is a part of splitting up https://github.com/rust-lang/rust/pull/122046 into smaller bits.

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