Rollup merge of #122237 - fee1-dead-contrib:rmord, r=compiler-errors

Remove `Ord` from `ClosureKind`

Using `Ord` to accomplish a meaning of subset relationship can be hard to read. The existing uses for that are easily replaced with a `match`, and in my opinion, more readable without needing to resorting to comments to explain the intention.

cc `@compiler-errors`