* Removes empty blocks doing if simplifications and loop simplifications.
* A block is empty if it contains only a Jmp node and Phi nodes.
* Merges single entry single exit blocks with their predecessor
- * and propagates dead control flow by calling equivalent_node.
+ * and propagates dead control flow by calling equivalent_node().
* Independent of compiler flag it removes Tuples from cf edges,
- * Bad predecessors form Blocks and Phis, and unnecessary predecessors of End.
+ * Bad predecessors from Blocks and Phis, and unnecessary predecessors of End.
*
* @bug So far destroys backedge information.
* @bug Chokes on Id nodes if called in a certain order with other