Rollup merge of #121706 - Nadrieril:simplify-sort-candidate, r=matthewjasper

match lowering: Remove hacky branch in sort_candidate

Reusing `self.test()` there wasn't actually pulling a lot of weight. In particular the `TestKind::Len` cases were all already correctly handled.

r? `@matthewjasper`

Author: matthiaskrgr