Continue learning for calls in optimized code when we have no type feedback.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index b59f5c79494117a109f487f0fc09baad83229167..54007c524a6cd376a357770eaeaaa28b6e04af8f 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -9348,7 +9348,19 @@ void HOptimizedGraphBuilder::VisitCall(Call* expr) {
       Push(graph()->GetConstantUndefined());
       CHECK_ALIVE(VisitExpressions(expr->arguments()));
       PushArgumentsFromEnvironment(argument_count);
-      call = New<HCallFunction>(function, argument_count);
+      HCallFunction* call_function =
+          New<HCallFunction>(function, argument_count);
+      call = call_function;
+      if (expr->is_uninitialized() && expr->HasCallFeedbackSlot()) {
+        // We've never seen this call before, so let's have Crankshaft learn
+        // through the type vector.
+        Handle<SharedFunctionInfo> current_shared =
+            function_state()->compilation_info()->shared_info();
+        Handle<TypeFeedbackVector> vector =
+            handle(current_shared->feedback_vector(), isolate());
+        FeedbackVectorICSlot slot = expr->CallFeedbackSlot();
+        call_function->SetVectorAndSlot(vector, slot);
+      }
     }
   }