Auto merge of #50812 - kennytm:fix-50756-miri-bad-float-behavior, r=oli-obk

Fix issue #50811 (`NaN > NaN` was true).

Fix #50811

Make sure the float comparison output is consistent with the expected behavior when NaN is involved.

----

Note: This PR is a **BREAKING CHANGE**. If you have used `>` or `>=` to compare floats, and make the result as the length of a fixed array type, like:

```rust
use std::f64::NAN;
let x: [u8; (NAN > NAN) as usize] = [1];
```

then the code will no longer compile. Previously, all float comparison involving NaN will just return "Greater", i.e. `NAN > NAN` would wrongly return `true` during const evaluation. If you need to retain the old behavior (why), you may replace `a > b` with `a != a || b != b || a > b`.

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