Use a WeakCell in the CallIC type vector.

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index 8308d83a27688635556e940098dd9a66510589b3..51fb9204f200b0be082bde27b64c02096c23857c 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -28,6 +28,7 @@ class PlatformInterfaceDescriptor;
   V(FastCloneShallowArray)                    \
   V(FastCloneShallowObject)                   \
   V(CreateAllocationSite)                     \
+  V(CreateWeakCell)                           \
   V(CallFunction)                             \
   V(CallFunctionWithFeedback)                 \
   V(CallFunctionWithFeedbackAndVector)        \
@@ -318,6 +319,19 @@ class CreateAllocationSiteDescriptor : public CallInterfaceDescriptor {
 };
 
 
+class CreateWeakCellDescriptor : public CallInterfaceDescriptor {
+ public:
+  enum ParameterIndices {
+    kVectorIndex,
+    kSlotIndex,
+    kValueIndex,
+    kParameterCount
+  };
+
+  DECLARE_DESCRIPTOR(CreateWeakCellDescriptor, CallInterfaceDescriptor)
+};
+
+
 class CallFunctionDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(CallFunctionDescriptor, CallInterfaceDescriptor)