We don't need this to know it is a set

Author: enebo

core/src/main/java/org/jruby/ir/representations/CFG.java

@@ -188,7 +188,7 @@ public Iterable<BasicBlock> getOutgoingDestinationsNotOfType(BasicBlock block, O
         return graph.findVertexFor(block).getOutgoingDestinationsDataNotOfType(type);
     }
 
-    public Set<Edge<BasicBlock>> getOutgoingEdges(BasicBlock block) {
+    public Collection<Edge<BasicBlock>> getOutgoingEdges(BasicBlock block) {
         return graph.findVertexFor(block).getOutgoingEdges();
     }