[snapshot] Move builtins generation into mksnapshot

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

Index: test/cctest/setup-isolate-for-tests.h
diff --git a/test/cctest/setup-isolate-for-tests.h b/test/cctest/setup-isolate-for-tests.h
new file mode 100644
index 0000000000000000000000000000000000000000..5a2894ca4a185e1a3a7e8bc571537b7d8a9de126
--- /dev/null
+++ b/test/cctest/setup-isolate-for-tests.h
@@ -0,0 +1,22 @@
+// 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/setup-isolate.h"
+
+namespace v8 {
+namespace internal {
+
+class SetupIsolateDelegateForTests : public SetupIsolateDelegate {
+ public:
+  SetupIsolateDelegateForTests() : SetupIsolateDelegate() {}
+  virtual ~SetupIsolateDelegateForTests() {}
+
+  void SetupBuiltins(Isolate* isolate, bool create_heap_objects) override;
+
+  void SetupInterpreter(interpreter::Interpreter* interpreter,
+                        bool create_heap_objects) override;
+};
+
+}  // namespace internal
+}  // namespace v8