src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.common/src/org/graalvm/compiler/core/common/type/StampPair.java

*** 22,31 ****
--- 22,33 ----
   */
  
  
  package org.graalvm.compiler.core.common.type;
  
+ import java.util.Objects;
+ 
  /**
   * A pair of stamp with one being the stamp that can be trusted and the other one being a guess that
   * needs a dynamic check to be used.
   */
  public final class StampPair {
*** 61,66 ****
--- 63,86 ----
              return trustedStamp.toString();
          } else {
              return trustedStamp + " (unchecked=" + uncheckedStamp + ")";
          }
      }
+ 
+     @Override
+     public int hashCode() {
+         return trustedStamp.hashCode() + 11 + (uncheckedStamp != null ? uncheckedStamp.hashCode() : 0);
+ 
+     }
+ 
+     @Override
+     public boolean equals(Object obj) {
+         if (obj == this) {
+             return true;
+         }
+         if (obj instanceof StampPair) {
+             StampPair other = (StampPair) obj;
+             return trustedStamp.equals(other.trustedStamp) && Objects.equals(uncheckedStamp, other.uncheckedStamp);
+         }
+         return false;
+     }
  }