[turbofan] Add appropriate types to express Callable.

src/runtime/runtime-test.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include <memory>
 
 #include "src/arguments.h"
 #include "src/compiler-dispatcher/optimizing-compile-dispatcher.h"
@@ skipping 281 matching lines @@
 }
 
 
 RUNTIME_FUNCTION(Runtime_GetOptimizationCount) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
   return Smi::FromInt(function->shared()->opt_count());
 }
 
+static void ReturnThis(const v8::FunctionCallbackInfo<v8::Value>& args) {
+  args.GetReturnValue().Set(args.This());
+}
 
 RUNTIME_FUNCTION(Runtime_GetUndetectable) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
 
   Local<v8::ObjectTemplate> desc = v8::ObjectTemplate::New(v8_isolate);
   desc->MarkAsUndetectable();
+  desc->SetCallAsFunctionHandler(ReturnThis);
   Local<v8::Object> obj;
   if (!desc->NewInstance(v8_isolate->GetCurrentContext()).ToLocal(&obj)) {
     return nullptr;
   }
   return *Utils::OpenHandle(*obj);
 }
 
 static void call_as_function(const v8::FunctionCallbackInfo<v8::Value>& args) {
   double v1 = args[0]
                   ->NumberValue(v8::Isolate::GetCurrent()->GetCurrentContext())
@@ skipping 501 matching lines @@
 RUNTIME_FUNCTION(Runtime_ValidateWasmOrphanedInstance) {
   HandleScope shs(isolate);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED_2(WasmInstanceObject, instance, 0);
   wasm::testing::ValidateOrphanedInstance(isolate, instance);
   return isolate->heap()->ToBoolean(true);
 }
 
 }  // namespace internal
 }  // namespace v8