Provide call counts for constructor calls, surface them as a vector IC.

src/code-factory.cc

Index: src/code-factory.cc
diff --git a/src/code-factory.cc b/src/code-factory.cc
index c1210df3621c777d24f9591fb8fe96b03601300c..2c782499f5541e1a72d978e97ef4353bfee424a6 100644
--- a/src/code-factory.cc
+++ b/src/code-factory.cc
@@ -75,6 +75,13 @@ Callable CodeFactory::CallICInOptimizedCode(Isolate* isolate, int argc,
 
 
 // static
+Callable CodeFactory::ConstructIC(Isolate* isolate) {
+  ConstructICStub stub(isolate);
+  return Callable(stub.GetCode(), stub.GetCallInterfaceDescriptor());
+}
+
+
+// static
 Callable CodeFactory::StoreIC(Isolate* isolate, LanguageMode language_mode) {
   return Callable(
       StoreIC::initialize_stub(isolate, language_mode, UNINITIALIZED),