Rollup merge of #103084 - inquisitivecrystal:control-flow, r=scottmcm

Rollup merge of #103084 - inquisitivecrystal:control-flow, r=scottmcm

Derive `Eq` and `Hash` for `ControlFlow`

There's really no reason for `ControlFlow` not to derive these traits. This is the part of #96416 that no one objected to, but that PR seems stale. The `Eq` derive was also [requested](https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/.60ControlFlow.3A.20Eq.60/near/303610659) by `@lcnr` on Zulip to allow for pattern matching.

This change requires an FCP because it's insta-stable.

Closes #96416.