-ops-to-preserve : Comma separated list of ops that should not be pruned regardless of reachability
```
### `-tf-executor-island-coarsening`

_Walks tf_executor::GraphOp and merges individual tf_executor::IslandOps._

This pass performs whole graph analysis for a graph encapsulated into tf_executor::GraphOp.
The analysis identifies all IslandOps within the graph which could be merged together.
The goal is to merge as many islands as possible.