[MNG-5140] keep reports order in reportSet when merging

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-2/branches/maven-2.2.x@1151649 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/maven-project/src/main/java/org/apache/maven/project/ModelUtils.java b/maven-project/src/main/java/org/apache/maven/project/ModelUtils.java
index bf86d4e..9052d2c 100644
--- a/maven-project/src/main/java/org/apache/maven/project/ModelUtils.java
+++ b/maven-project/src/main/java/org/apache/maven/project/ModelUtils.java
@@ -802,7 +802,7 @@
 
         if ( ( parentReportSets != null ) && !parentReportSets.isEmpty() )
         {
-            Map<String, ReportSet> assembledReportSets = new TreeMap<String, ReportSet>();
+            Map<String, ReportSet> assembledReportSets = new LinkedHashMap<String, ReportSet>();
 
             Map<String, ReportSet> childReportSets = child.getReportSetsAsMap();