Make maps in monomorphic IC stubs weak.

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index 0ebe8a0f747846193bfd0002cccd8bec247df4a0..377b32ebd788e381759bc0960d025c5688423f53 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -638,7 +638,7 @@ class MarkCompactCollector {
   void VerifyMarkbitsAreClean();
   static void VerifyMarkbitsAreClean(PagedSpace* space);
   static void VerifyMarkbitsAreClean(NewSpace* space);
-  void VerifyWeakEmbeddedObjectsInOptimizedCode();
+  void VerifyWeakEmbeddedObjectsInCode();
   void VerifyOmittedMapChecks();
 #endif
 
@@ -902,6 +902,9 @@ class MarkCompactCollector {
   void ClearAndDeoptimizeDependentCode(DependentCode* dependent_code);
   void ClearNonLiveDependentCode(DependentCode* dependent_code);
 
+  void ClearAndInvalidateDependentIC(Map* map);
+  void ClearNonLiveDependentIC(Map* map);
+
   // Marking detaches initial maps from SharedFunctionInfo objects
   // to make this reference weak. We need to reattach initial maps
   // back after collection. This is either done during