Revert of [snapshot] Move builtins generation into mksnapshot

src/setup-isolate-deserialize.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 "src/setup-isolate.h"
-
-#include "src/base/logging.h"
-#include "src/interpreter/interpreter.h"
-#include "src/isolate.h"
-#include "src/ostreams.h"
-
-namespace v8 {
-namespace internal {
-
-void SetupIsolateDelegate::SetupBuiltins(Isolate* isolate,
-                                         bool create_heap_objects) {
-  DCHECK(!create_heap_objects);
-  // No actual work to be done; builtins will be deserialized from the snapshot.
-  isolate->builtins()->MarkInitialized();
-}
-
-void SetupIsolateDelegate::SetupInterpreter(
-    interpreter::Interpreter* interpreter, bool create_heap_objects) {
-#ifdef V8_USE_SNAPSHOT
-  if (FLAG_trace_ignition || FLAG_trace_ignition_codegen ||
-      FLAG_trace_ignition_dispatches) {
-    OFStream os(stdout);
-    os << "Warning: --trace-ignition-* flags must be passed at mksnapshot "
-       << "time or used with nosnapshot builds." << std::endl;
-  }
-#endif
-  DCHECK(interpreter->IsDispatchTableInitialized());
-}
-
-}  // namespace internal
-}  // namespace v8