Update assertion to account for computing NOT_COMPUTED_HASH_CODE

Bug: 153391780
Change-Id: Id2e55bf02efe47969c11171fa1384a3d32a7a19b
diff --git a/src/main/java/com/android/tools/r8/graph/CachedHashValueDexItem.java b/src/main/java/com/android/tools/r8/graph/CachedHashValueDexItem.java
index 749ce04..eda8647 100644
--- a/src/main/java/com/android/tools/r8/graph/CachedHashValueDexItem.java
+++ b/src/main/java/com/android/tools/r8/graph/CachedHashValueDexItem.java
@@ -26,11 +26,20 @@
       }
       hash = cache;
     }
-    assert cache == computeHashCode()
-        : "Hash code for " + this + " has changed from " + hash + " to " + computeHashCode();
+    assert verifyHashCodeConsistent(cache);
     return cache;
   }
 
+  private boolean verifyHashCodeConsistent(int computedValue) {
+    int newComputedValue = computeHashCode();
+    if (newComputedValue == NOT_COMPUTED_HASH_VALUE) {
+      newComputedValue = SENTINEL_HASH_VALUE;
+    }
+    assert computedValue == newComputedValue
+        : "Hash code for " + this + " has changed from " + hash + " to " + newComputedValue;
+    return true;
+  }
+
   @Override
   public void flushCachedValues() {
     super.flushCachedValues();