src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/cfg/AbstractBlockBase.java

*** 22,31 ****
--- 22,33 ----
   */
  
  
  package org.graalvm.compiler.core.common.cfg;
  
+ import java.util.Comparator;
+ 
  public abstract class AbstractBlockBase<T extends AbstractBlockBase<T>> {
  
      protected int id;
      protected int domDepth;
  
*** 169,174 ****
--- 171,185 ----
  
      @Override
      public int hashCode() {
          return id;
      }
+ 
+     public static class BlockIdComparator implements Comparator<AbstractBlockBase<?>> {
+         @Override
+         public int compare(AbstractBlockBase<?> o1, AbstractBlockBase<?> o2) {
+             return Integer.compare(o1.getId(), o2.getId());
+         }
+     }
+ 
+     public static final BlockIdComparator BLOCK_ID_COMPARATOR = new BlockIdComparator();
  }