Use a WeakCell in the CallIC type vector.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index b5ea4427c3369c91190e7c95c08fb16c06a54d58..864fbadbba4b2c0f7b0208ea00aaf89835c3eda4 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -63,6 +63,7 @@ namespace internal {
   V(BinaryOpWithAllocationSite)             \
   V(CompareNilIC)                           \
   V(CreateAllocationSite)                   \
+  V(CreateWeakCell)                         \
   V(ElementsTransitionAndStore)             \
   V(FastCloneShallowArray)                  \
   V(FastCloneShallowObject)                 \
@@ -676,6 +677,17 @@ class CreateAllocationSiteStub : public HydrogenCodeStub {
 };
 
 
+class CreateWeakCellStub : public HydrogenCodeStub {
+ public:
+  explicit CreateWeakCellStub(Isolate* isolate) : HydrogenCodeStub(isolate) {}
+
+  static void GenerateAheadOfTime(Isolate* isolate);
+
+  DEFINE_CALL_INTERFACE_DESCRIPTOR(CreateWeakCell);
+  DEFINE_HYDROGEN_CODE_STUB(CreateWeakCell, HydrogenCodeStub);
+};
+
+
 class InstanceofStub: public PlatformCodeStub {
  public:
   enum Flags {