Sort impacted methods deterministically
Sort impacted methods deterministically

Summary:
A recent refactoring of the barrier computation in CSE made two reported metrics non-deterministic:
```
- num_inlined_barriers_into_methods
- num_inlined_barriers_iterations
```

The overall result of CSE was still deterministic, just these two internal reported metrics were not. This diff makes those metrics deterministic (in a way that may also speed up the barrier computation).

Reviewed By: int3

Differential Revision: D17465326

fbshipit-source-id: 64e918604b4e7cf0d18503f0f79219b9783fff49

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