[snapshot] Move builtins generation into mksnapshot

test/cctest/setup-builtins-for-tests.h

Index: test/cctest/setup-builtins-for-tests.h
diff --git a/test/cctest/setup-builtins-for-tests.h b/test/cctest/setup-builtins-for-tests.h
new file mode 100644
index 0000000000000000000000000000000000000000..9ee7c2e4c3f872e205e315a517e8997acb0b876f
--- /dev/null
+++ b/test/cctest/setup-builtins-for-tests.h
@@ -0,0 +1,19 @@
+// Copyright 2017 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/builtins/setup-builtins.h"
+
+namespace v8 {
+namespace internal {
+
+class SetupBuiltinsDelegateForTests : public SetupBuiltinsDelegate {
+ public:
+  SetupBuiltinsDelegateForTests() : SetupBuiltinsDelegate() {}
+  virtual ~SetupBuiltinsDelegateForTests() {}
+
+  void SetupBuiltins(Isolate* isolate, bool create_heap_objects) override;
+};
+
+}  // namespace internal
+}  // namespace v8