Rollup merge of #59811 - vext01:dead-dominator-code, r=oli-obk

Kill dead code dominator code.

Hi,

Whilst fiddling around in the dominator code, I found some (I think) unused code. This code *was* used at the time it was imported, but over time it seems to have become redundant.

I've tested a build up to stage 1 with no problems. Maybe the tests will turn up something though.

P.S.

There is a FIXME comment in `dominators/mod.rs`:
```
    pub fn is_dominated_by(&self, node: Node, dom: Node) -> bool {
        // FIXME -- could be optimized by using post-order-rank
        self.dominators(node).any(|n| n == dom)
    }
```

I'm not sure of the intention of this comment. The `Dominators` struct already operates over post-order rank nodes. Any ideas?

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