Correctly implement ImmutableMap::getMaxElement() by getting the actual <key, value> pair.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65327 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/ADT/ImmutableMap.h b/include/llvm/ADT/ImmutableMap.h
index 00d5902..52708bc 100644
--- a/include/llvm/ADT/ImmutableMap.h
+++ b/include/llvm/ADT/ImmutableMap.h
@@ -207,7 +207,7 @@
   ///  which key is the highest in the ordering of keys in the map.  This
   ///  method returns NULL if the map is empty.
   value_type* getMaxElement() const {
-    return Root ? &(Root->getMaxElement()) : 0;
+    return Root ? &(Root->getMaxElement()->getValue()) : 0;
   }
 
   //===--------------------------------------------------===//