Remove prototype checks for leaf maps in optimized code.

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index 7a328576508f092c228e72f77534cd4b7ffe03ff..9029f87cf393e9552316e0415af285b1348e6987 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -608,6 +608,7 @@ class MarkCompactCollector {
   static void VerifyMarkbitsAreClean(PagedSpace* space);
   static void VerifyMarkbitsAreClean(NewSpace* space);
   void VerifyWeakEmbeddedMapsInOptimizedCode();
+  void VerifyOmittedPrototypeChecks();
 #endif
 
   // Sweep a single page from the given space conservatively.
@@ -833,8 +834,8 @@ class MarkCompactCollector {
   void ClearNonLivePrototypeTransitions(Map* map);
   void ClearNonLiveMapTransitions(Map* map, MarkBit map_mark);
 
-  void ClearAndDeoptimizeDependentCodes(Map* map);
-  void ClearNonLiveDependentCodes(Map* map);
+  void ClearAndDeoptimizeDependentCode(Map* map);
+  void ClearNonLiveDependentCode(Map* map);
 
   // Marking detaches initial maps from SharedFunctionInfo objects
   // to make this reference weak. We need to reattach initial maps