android/guava/src/com/google/common/collect/HashBiMap.java
int findEntryByKey(@NullableDecl Object key, int keyHash) {
    return findEntry(key, keyHash, hashTableKToV, nextInBucketKToV, keys);
  }
int findEntryByKey(@NullableDecl Object key, int keyHash) {
    return findEntry(key, keyHash, hashTableKToV, nextInBucketKToV, keys);
  }
Given a key and its hash, returns the index of the entry in the tables, or ABSENT if not found.