HHH-19195 Discriminator values should be hierarchically sorted.

          While collecting they are inserted in proper order, but TreeMap will
          not preserver ordering, but sort them alphabetically by names.
          To keep values order LinkedHashMap should be used instead of TreeMap.

Author: cigaly

hibernate-core/src/main/java/org/hibernate/boot/model/internal/EmbeddableBinder.java

@@ -59,10 +59,10 @@
 import java.lang.reflect.Type;
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
-import java.util.TreeMap;
 
 import static org.hibernate.boot.model.internal.AnnotatedDiscriminatorColumn.DEFAULT_DISCRIMINATOR_COLUMN_NAME;
 import static org.hibernate.boot.model.internal.AnnotatedDiscriminatorColumn.buildDiscriminatorColumn;
@@ -516,7 +516,7 @@ static Component fillEmbeddable(
 			final BasicType<?> discriminatorType = (BasicType<?>) component.getDiscriminator().getType();
 			// Discriminator values are used to construct the embeddable domain
 			// type hierarchy so order of processing is important
-			final Map<Object, String> discriminatorValues = new TreeMap<>();
+			final Map<Object, String> discriminatorValues = new LinkedHashMap<>();
 			collectDiscriminatorValue( returnedClassOrElement, discriminatorType, discriminatorValues );
 			collectSubclassElements(
 					propertyAccessor,