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

*** 219,229 ****
  
          protected void registerCombinedStamps(MergeNode node) {
              EconomicMap<ValueNode, Stamp> endMap = endMaps.get(node);
              MapCursor<ValueNode, Stamp> entries = endMap.getEntries();
              while (entries.advance()) {
!                 if (registerNewValueStamp(entries.getKey(), entries.getValue())) {
                      counterBetterMergedStamps.increment(debug);
                  }
              }
          }
  
--- 219,234 ----
  
          protected void registerCombinedStamps(MergeNode node) {
              EconomicMap<ValueNode, Stamp> endMap = endMaps.get(node);
              MapCursor<ValueNode, Stamp> entries = endMap.getEntries();
              while (entries.advance()) {
!                 ValueNode value = entries.getKey();
!                 if (value.isDeleted()) {
!                     // nodes from this map can be deleted when a loop dies
!                     continue;
!                 }
!                 if (registerNewValueStamp(value, entries.getValue())) {
                      counterBetterMergedStamps.increment(debug);
                  }
              }
          }