Add a basic compiler dispatcher

test/unittests/compiler-dispatcher/compiler-dispatcher-helper.cc

+// Copyright 2016 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 "test/unittests/compiler-dispatcher/compiler-dispatcher-helper.h"
+
+#include <memory>
+
+#include "include/v8.h"
+#include "src/api.h"
+
+namespace v8 {
+namespace internal {
+
+Handle<Object> RunJS(v8::Isolate* isolate, const char* script) {
+  return Utils::OpenHandle(
+      *v8::Script::Compile(
+           isolate->GetCurrentContext(),
+           v8::String::NewFromUtf8(isolate, script, v8::NewStringType::kNormal)
+               .ToLocalChecked())
+           .ToLocalChecked()
+           ->Run(isolate->GetCurrentContext())
+           .ToLocalChecked());
+}
+
+}  // namespace internal
+}  // namespace v8