[ruby/yarp] Use compact_child_nodes where possible

https://github.com/ruby/yarp/commit/c1911fa9b1

lib/yarp.rb

@@ -520,7 +520,7 @@ module YARP
           locals << [] if node.once?
         end
 
-        stack.concat(node.child_nodes.compact)
+        stack.concat(node.compact_child_nodes)
       end
 
       locals

lib/yarp/pattern.rb

@@ -73,7 +73,7 @@ module YARP
 
       while (node = queue.shift)
         yield node if @compiled.call(node)
-        queue.concat(node.child_nodes.compact)
+        queue.concat(node.compact_child_nodes)
       end
     end
 

test/yarp/parse_serialize_test.rb

@@ -31,7 +31,7 @@ module YARP
 
       while (node = queue.shift)
         return node if node.is_a?(SourceFileNode)
-        queue.concat(node.child_nodes.compact)
+        queue.concat(node.compact_child_nodes)
       end
     end
   end

test/yarp/parse_test.rb

@@ -204,7 +204,7 @@ module YARP
       queue = [program]
       while (node = queue.shift)
         return node if node.is_a?(SourceFileNode)
-        queue.concat(node.child_nodes.compact)
+        queue.concat(node.compact_child_nodes)
       end
     end