Unify implementations of Map handles vectors and lists

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 1a5f09c7155b2e31baf549e49eba3a438df75576..5cbd04b052c5928231849204d4d19200301a687c 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -4438,6 +4438,7 @@ class DependentCode: public FixedArray {
 
 class PrototypeInfo;
 
+typedef std::vector<Handle<Map>> MapHandles;
 
 // All heap objects have a Map that describes their structure.
 //  A Map contains information about:
@@ -4960,7 +4961,7 @@ class Map: public HeapObject {
   // Returns the transitioned map for this map with the most generic
   // elements_kind that's found in |candidates|, or |nullptr| if no match is
   // found at all.
-  Map* FindElementsKindTransitionedMap(MapHandleList* candidates);
+  Map* FindElementsKindTransitionedMap(MapHandles const& candidates);
 
   inline bool CanTransition();