Use a WeakCell in the CallIC type vector.

src/ia32/interface-descriptors-ia32.cc

Index: src/ia32/interface-descriptors-ia32.cc
diff --git a/src/ia32/interface-descriptors-ia32.cc b/src/ia32/interface-descriptors-ia32.cc
index 68310ff4f3a8baf81f6af0e05bc7f69aa56a968f..b0e57fc2e2b128b28a4f956465f460aa43c82c43 100644
--- a/src/ia32/interface-descriptors-ia32.cc
+++ b/src/ia32/interface-descriptors-ia32.cc
@@ -101,7 +101,19 @@ void FastCloneShallowObjectDescriptor::Initialize(
 void CreateAllocationSiteDescriptor::Initialize(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {esi, ebx, edx};
-  data->Initialize(arraysize(registers), registers, NULL);
+  Representation representations[] = {Representation::Tagged(),
+                                      Representation::Tagged(),
+                                      Representation::Smi()};
+  data->Initialize(arraysize(registers), registers, representations);
+}
+
+
+void CreateWeakCellDescriptor::Initialize(CallInterfaceDescriptorData* data) {
+  Register registers[] = {esi, ebx, edx, edi};
+  Representation representations[] = {
+      Representation::Tagged(), Representation::Tagged(), Representation::Smi(),
+      Representation::Tagged()};
+  data->Initialize(arraysize(registers), registers, representations);
 }