Use a WeakCell in the CallIC type vector.

src/code-stubs.cc

Index: src/code-stubs.cc
diff --git a/src/code-stubs.cc b/src/code-stubs.cc
index 895569d41357ca34acea2c232dc406044a8cd64d..ecd8ef2d563049b294c2e714bea9cac69704b68e 100644
--- a/src/code-stubs.cc
+++ b/src/code-stubs.cc
@@ -679,6 +679,9 @@ void FastCloneShallowObjectStub::InitializeDescriptor(
 void CreateAllocationSiteStub::InitializeDescriptor(CodeStubDescriptor* d) {}
 
 
+void CreateWeakCellStub::InitializeDescriptor(CodeStubDescriptor* d) {}
+
+
 void RegExpConstructResultStub::InitializeDescriptor(
     CodeStubDescriptor* descriptor) {
   descriptor->Initialize(
@@ -738,6 +741,12 @@ void CreateAllocationSiteStub::GenerateAheadOfTime(Isolate* isolate) {
 }
 
 
+void CreateWeakCellStub::GenerateAheadOfTime(Isolate* isolate) {
+  CreateWeakCellStub stub(isolate);
+  stub.GetCode();
+}
+
+
 void StoreElementStub::Generate(MacroAssembler* masm) {
   switch (elements_kind()) {
     case FAST_ELEMENTS: