Remove prototype checks for leaf maps in optimized code.

src/objects-debug.cc

Index: src/objects-debug.cc
diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 8c7a94478b4d895fb2b82fb56a56ec6bbd0dfe09..fe707c72ad0b8f09842796adaac0a093dbf3b7ee 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -329,6 +329,15 @@ void Map::SharedMapVerify() {
 }
 
 
+void Map::VerifyOmittedPrototypeChecks() {
+  if (!FLAG_omit_prototype_checks_for_leaf_maps) return;
+  if (HasTransitionArray() || is_dictionary_map()) {
+    CHECK_EQ(0, dependent_code()->number_of_entries(
+        DependentCode::kPrototypeCheckGroup));
+  }
+}
+
+
 void CodeCache::CodeCacheVerify() {
   VerifyHeapPointer(default_cache());
   VerifyHeapPointer(normal_type_cache());
@@ -604,7 +613,8 @@ void Code::VerifyEmbeddedMapsDependency() {
       it.rinfo()->target_object()->IsMap()) {
       Map* map = Map::cast(it.rinfo()->target_object());
       if (map->CanTransition()) {
-        CHECK(map->dependent_codes()->Contains(this));
+        CHECK(map->dependent_code()->Contains(
+            DependentCode::kWeaklyEmbeddedGroup, this));
       }
     }
   }