Simplify and compact transitions storage

test/cctest/test-migrations.cc

Index: test/cctest/test-migrations.cc
diff --git a/test/cctest/test-migrations.cc b/test/cctest/test-migrations.cc
index c7aaf29d6643e420254aeefa6d4df871ed6ca99e..3be173453a5b407b6614af55f0dd348594df0030 100644
--- a/test/cctest/test-migrations.cc
+++ b/test/cctest/test-migrations.cc
@@ -342,9 +342,10 @@ class Expectations {
     SetDataField(property_index, attributes, representation, heap_type);
 
     Handle<String> name = MakeName("prop", property_index);
-    int t = map->SearchTransition(kData, *name, attributes);
-    CHECK_NE(TransitionArray::kNotFound, t);
-    return handle(map->GetTransition(t));
+    Map* target =
+        TransitionArray::SearchTransition(*map, kData, *name, attributes);
+    CHECK(target != NULL);
+    return handle(target);
   }
 
   Handle<Map> AddAccessorConstant(Handle<Map> map,
@@ -1477,9 +1478,10 @@ TEST(ReconfigurePropertySplitMapTransitionsOverflow) {
       }
 
       Handle<String> name = MakeName("prop", i);
-      int t = map2->SearchTransition(kData, *name, NONE);
-      CHECK_NE(TransitionArray::kNotFound, t);
-      map2 = handle(map2->GetTransition(t));
+      Map* target =
+          TransitionArray::SearchTransition(*map2, kData, *name, NONE);
+      CHECK(target != NULL);
+      map2 = handle(target);
     }
 
     map2 = Map::ReconfigureProperty(map2, kSplitProp, kData, NONE,
@@ -1499,12 +1501,12 @@ TEST(ReconfigurePropertySplitMapTransitionsOverflow) {
 
   // Fill in transition tree of |map2| so that it can't have more transitions.
   for (int i = 0; i < TransitionArray::kMaxNumberOfTransitions; i++) {
-    CHECK(map2->CanHaveMoreTransitions());
+    CHECK(TransitionArray::CanHaveMoreTransitions(map2));
     Handle<String> name = MakeName("foo", i);
     Map::CopyWithField(map2, name, any_type, NONE, Representation::Smi(),
                        INSERT_TRANSITION).ToHandleChecked();
   }
-  CHECK(!map2->CanHaveMoreTransitions());
+  CHECK(!TransitionArray::CanHaveMoreTransitions(map2));
 
   // Try to update |map|, since there is no place for propX transition at |map2|
   // |map| should become "copy-generalized".