src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.phases/src/org/graalvm/compiler/phases/PhaseSuite.java

*** 70,79 ****
--- 70,103 ----
      public final void appendPhase(BasePhase<? super C> phase) {
          phases.add(phase);
      }
  
      /**
+      * Inserts a phase before the last phase in the suite. If the suite contains no phases the new
+      * phase will be inserted as the first phase.
+      */
+     public final void addBeforeLast(BasePhase<? super C> phase) {
+         ListIterator<BasePhase<? super C>> last = findLastPhase();
+         if (last.hasPrevious()) {
+             last.previous();
+         }
+         last.add(phase);
+     }
+ 
+     /**
+      * Returns a {@link ListIterator} at the position of the last phase in the suite. If the suite
+      * has no phases then it will return an empty iterator.
+      */
+     private ListIterator<BasePhase<? super C>> findLastPhase() {
+         ListIterator<BasePhase<? super C>> it = phases.listIterator();
+         while (it.hasNext()) {
+             it.next();
+         }
+         return it;
+     }
+ 
+     /**
       * Returns a {@link ListIterator} at the position of the first phase which is an instance of
       * {@code phaseClass} or null if no such phase can be found.
       *
       * Calling {@link ListIterator#previous()} would return the phase that was found.
       *