Revert of [snapshot] Move builtins generation into mksnapshot

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

-// 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 "test/cctest/setup-isolate-for-tests.h"
-
-#include "src/interpreter/setup-interpreter.h"
-
-namespace v8 {
-namespace internal {
-
-void SetupIsolateDelegateForTests::SetupBuiltins(Isolate* isolate,
-                                                 bool create_heap_objects) {
-  if (create_heap_objects) {
-    SetupBuiltinsInternal(isolate);
-  }
-}
-
-void SetupIsolateDelegateForTests::SetupInterpreter(
-    interpreter::Interpreter* interpreter, bool create_heap_objects) {
-  if (create_heap_objects) {
-    interpreter::SetupInterpreter::InstallBytecodeHandlers(interpreter);
-  }
-}
-
-}  // namespace internal
-}  // namespace v8