Remove CallFunctionStub, always call through the Call builtin (also from CallIC)

src/ic/ic.h

Index: src/ic/ic.h
diff --git a/src/ic/ic.h b/src/ic/ic.h
index 907631cbfefe188684b3966e5b4c1308e23fae7b..3af460372b4055ac01cd8d1af49dce6a06e5a13e 100644
--- a/src/ic/ic.h
+++ b/src/ic/ic.h
@@ -286,10 +286,9 @@ class CallIC : public IC {
   void HandleMiss(Handle<Object> function);
 
   // Code generator routines.
-  static Handle<Code> initialize_stub(Isolate* isolate, int argc,
-                                      CallICState::CallType call_type);
-  static Handle<Code> initialize_stub_in_optimized_code(
-      Isolate* isolate, int argc, CallICState::CallType call_type);
+  static Handle<Code> initialize_stub(Isolate* isolate, int argc);
+  static Handle<Code> initialize_stub_in_optimized_code(Isolate* isolate,
+                                                        int argc);
 
   static void Clear(Isolate* isolate, Code* host, CallICNexus* nexus);
 };